Welcome

AS8xCxxx Assembler

ACKNOWLEDGMENTS 

   Thanks to Bill McKinnon for his contributions to the AS8XCXXX
cross assembler.  

        Bill McKinnon
        w_mckinnon@conknet.com

   This  assembler  was  derived from the AS8051 cross assembler
contributed by John Hartman.  

        John L. Hartman
        jhartman@compuserve.com

DS8XCXXX ASSEMBLER DIRECTIVES 

   The  AS8XCXXX  assembler  contains  directives to specify the
processor core SFR (Special Function Registers) and  enable  the
SFR  Bit  Register values during the assembly process.  The fol-
lowing directives are supported:  

        .DS8XCXXX               ;80C32 core
        .DS80C310               ;Dallas Semiconductor
        .DS80C320               ;Microprocessors
        .DS80C323
        .DS80C390
        .DS83C520
        .DS83C530
        .DS83C550
        .DS87C520
        .DS87C530
        .DS87C550

The invocation of one of the processor directives creates a pro-
cessor specific symbol and an SFR-Bits symbol.  For example  the
directive 

        .DS80C390

creates  the  global  symbols '__DS80C390' and '__SFR_BITS' each
with a value of 1.  If the microprocessor core selection  direc-
tive  is  followed  by  an  optional  argument  then  the symbol
'__SFR_BITS' is given the  value  of  the  argument.   The  file
DS8XCXXX.SFR  contains  the  SFR and SFR register bit values for
all the microprocessor selector directives.  This  file  may  be
modified to create a new SFR for other microprocessor types.  

   If a microprocessor selection directive is not specified then
no processor symbols will be defined.  This mode allows the  SFR
and SFR register bit values to be defined by the assembly source
file.  


.cpu Directive 

   The  .cpu  directive  is  similar  to the processor selection
directives.  This directive defines a  new  processor  type  and
creates a user defined symbol:  

        .cpu    "CP84C331"      2

   creates  the  symbol  '__CP84C331'  with a value of 1 and the
symbol '__SFR_BITS' with a value of 2.  These values can be used
to  select  the  processor SFR and SFR register bits from an in-
clude file.  If the optional final argument, 2, is omitted  then
the value of the symbol '__SFR_BITS' is 1.  


Processor Addressing Range Directives 

   If one of the .DS8...  microprocessor selection directives is
not specified then the following address range assembler  direc-
tives are accepted:  

        .16bit                  ;16-Bit Addressing
        .24bit                  ;24-Bit Addressing
        .32bit                  ;32-Bit Addressing

These  directives specify the assembler addressing space and ef-
fect the output format for the .lst, .sym, and .rel files.  

   The  default  addressing space for defined microprocessors is
16-Bit except for the DS80C390 microprocessor which is 24-Bit.  

   The  .cpu  directive  defaults to the 16-Bit addressing range
but this can be changed using these directives.  


The .__.CPU.  Variable 

   The value of the pre-defined symbol '.__.CPU.' corresponds to
the selected processor type.  The default value is 0 which  cor-
responds  to  the  default  processor type.  The following table
lists the processor types and associated values for the AS8XCXXX
assembler:  

        Processor Type            .__.CPU. Value
        --------------            --------------
          .cpu                           0

          .DS8XCXXX                      1
          .DS80C310                      2
          .DS80C320                      3
          .DS80C323                      4
          .DS80C390                      5
          .DS83C520                      6
          .DS83C530                      7
          .DS83C550                      8
          .DS87C520                      9
          .DS87C530                     10
          .DS87C550                     11


   The  variable  '.__.CPU.'  is by default defined as local and
will not be output to the created .rel file.  The assembler com-
mand line options -g or -a will not cause the local symbol to be
output to the created .rel file.  

   The  assembler  .globl  directive  may  be used to change the
variable type to global causing its definition to be  output  to
the  .rel file.  The inclusion of the definition of the variable
'.__.CPU.' might be a useful means of validating that seperately
assembled  files have been compiled for the same processor type.
The linker will report an error for variables with multiple  non
equal definitions.  


DS80C390 Addressing Mode Directive 

   The  DS80C390  microprocessor  supports 16-Bit and 24-Bit ad-
dressing modes.   The  .amode  assembler  directive  provides  a
method  to  select  the addressing mode used by the ajmp, acall,
ljmp, and lcall instructions.  These four  instructions  support
16  and  24 bit addressing modes selected by bits AM0 and AM1 in
the ACON register.  The assembler is 'informed'  about  the  ad-
dressing mode selected by using the .amode directive:  

        .amode  2       ;mode 2 is 24-bit addressing

If  a  second  argument  is specified and its value is non-zero,
then a three instruction sequence is inserted at the .amode  lo-
cation loading the mode bits into the ACON register:  

        .amode  2,1     ;mode 2 is 24-bit addressing, load ACON
        ;mov    ta,#0xAA
        ;mov    ta,#0x55
        ;mov    acon,#amode


DS8XCXXX REGISTER SET 

The  AS8XCXXX  cross assembler supports the Dallas Semiconductor
DS8XCXXX series of 8051-compatible devices.  These  microproces-
sors  retain  instruction set and object code compatability with
the 8051 microprocessor.  The DS8XCXXX family  is  updated  with
several   new  peripherals  while  providing  all  the  standard
features of the 80C32 microprocessor.  

   The following is a list of the registers used by AS8XCXXX:  

        a,b             -       8-bit accumulators
        r0,r1,r2,r3     -       8-bit registers
        r4,r5,r6,r7
        dptr            -       data pointer
        sp              -       stack pointer
        pc              -       program counter
        psw             -       status word
        c               -       carry (bit in status word)


DS8XCXXX INSTRUCTION SET 

   The  following  tables list all DS8XCXXX mnemonics recognized
by the AS8XCXXX assembler.  The  following  list  specifies  the
format for each addressing mode supported by AS8XCXXX:  

        #data           immediate data
                        byte or word data

        r,r1,r2         register r0,r1,r2,r3,r4,r5,r6, or r7

        @r              indirect on register r0 or r1
        @dptr           indirect on data pointer
        @a+dptr         indirect on accumulator
                        plus data pointer
        @a+pc           indirect on accumulator
                        plus program counter

        addr            direct memory address

        bitaddr         bit address

        label           call or jump label

The terms data, addr, bitaddr, and label may all be expressions. 

   Note  that  not all addressing modes are valid with every in-
struction.  Refer to  the  DS8XCXXX  technical  data  for  valid
modes.  


Inherent Instructions 

        nop


Move Instructions 

        mov     a,#data         mov     a,addr
        mov     a,r             mov     a,@r

        mov     r,#data         mov     r,addr
        mov     r,a

        mov     addr,a          mov     addr,#data
        mov     addr,r          mov     addr,@r
        mov     addr1,addr2     mov     bitaddr,c

        mov     @r,#data        mov     @r,addr
        mov     @r,a

        mov     c,bitaddr
        mov     dptr,#data

        movc    a,@a+dptr       movc    a,@a+pc
        movx    a,@dptr         movx    a,@r
        movx    @dptr,a         movx    @r,a


Single Operand Instructions 

        clr     a               clr     c
        clr     bitaddr
        cpl     a               cpl     c
        cpl     bitaddr
        setb    c               setb    bitaddr

        da      a               
        rr      a               rrc     a
        rl      a               rlc     a
        swap    a

        dec     a               dec     r
        dec     @r
        inc     a               inc     r
        inc     dptr            inc     @r

        div     ab              mul     ab

        pop     addr            push    addr


Two Operand Instructions 

        add     a,#data         add     a,addr
        add     a,r             add     a,@r
        addc    a,#data         addc    a,addr
        addc    a,r             addc    a,@r
        subb    a,#data         subb    a,addr
        subb    a,r             subb    a,@r
        orl     a,#data         orl     a,addr
        orl     a,r             orl     a,@r
        orl     addr,a          orl     addr,#data
        orl     c,bitaddr       orl     c,/bitaddr
        anl     a,#data         anl     a,addr
        anl     a,r             anl     a,@r
        anl     addr,a          anl     addr,#data
        anl     c,bitaddr       anl     c,/bitaddr
        xrl     a,#data         xrl     a,addr
        xrl     a,r             xrl     a,@r
        xrl     addr,a          xrl     addr,#data
        xrl     c,bitaddr       xrl     c,/bitaddr
        xch     a,addr          xch     a,r
        xch     a,@r            xchd    a,@r


Call and Return Instructions 

        acall   label           lcall   label
        ret                     reti
        in      data
        out     data
        rst     data


M.4.6  Jump Instructions 

        ajmp    label
        cjne    a,#data,label   cjne    a,addr,label
        cjne    r,#data,label   cjne    @r,#data,label
        djnz    r,label         djnz    addr,label
        jbc     bitadr,label
        jb      bitadr,label    jnb     bitadr,label
        jc      label           jnc     label
        jz      label           jnz     label
        jmp     @a+dptr
        ljmp    label           sjmp    label


DS8XCXXX SPECIAL FUNCTION REGISTERS 

   The  80C32 core Special Function Registers are selected using
the .DS8xCxxx assembler directive.  


DS8XCXXX SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80              SP      DPL     DPH         83
        84                              PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1                         8F
        90      P1                                  93
        94                                          97
        98      SCON    SBUF                        9B
        9C                                          9F
        A0      P2                                  A3
        A4                                          A7
        A8      IE      SADDR0                      AB
        AC                                          AF
        B0      P3                                  B3
        B4                                          B7
        B8      IP      SADEN0                      BB
        BC                                          BF
        C0                                          C3
        C4              STATUS                      C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2                         CF
        D0      PSW                                 D3
        D4                                          D7
        D8                                          DB
        DC                                          DF
        E0      ACC                                 E3
        E4                                          E7
        E8                                          EB
        EC                                          EF
        F0      B                                   F3
        F4                                          F7
        F8                                          FB
        FC                                          FF


DS8XCXXX SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
P1      90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
        C0                                          C3
        C4                                          C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
        D8                                          DB
        DC                                          DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
        E8                                          EB
        EC                                          EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
        F8                                          FB
        FC                                          FF


DS8XCXXX SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2             EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2                         BF
        C0                                          C3
        C4                                          C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
        D8                                          DB
        DC                                          DF
        E0                                          E3
        E4                                          E7
        E8                                          EB
        EC                                          EF
        F0                                          F3
        F4                                          F7
        F8                                          FB
        FC                                          FF

        Alternates:

SCON    98                                          9B
        9C                              FE          9F
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS8XCXXX SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
PCON    0x80    SMOD    SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
STATUS  0x80            HIP     LIP                 0x10
        0x08                                        0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01


DS80C310 SPECIAL FUNCTION REGISTERS 

   The  DS80C310  Special  Function Registers are selected using
the .DS80C310 assembler directive.  


DS80C310 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80              SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      P1      EXIF                        93
        94                                          97
        98      SCON    SBUF                        9B
        9C                                          9F
        A0      P2                                  A3
        A4                                          A7
        A8      IE      SADDR0                      AB
        AC                                          AF
        B0      P3                                  B3
        B4                                          B7
        B8      IP      SADEN0                      BB
        BC                                          BF
        C0                                          C3
        C4              STATUS                      C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2                         CF
        D0      PSW                                 D3
        D4                                          D7
        D8      WDCON                               DB
        DC                                          DF
        E0      ACC                                 E3
        E4                                          E7
        E8      EIE                                 EB
        EC                                          EF
        F0      B                                   F3
        F4                                          F7
        F8      EIP                                 FB
        FC                                          FF


DS80C310 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
P1      90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
        C0                                          C3
        C4                                          C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
WDCON   D8      WDCON.0 WDCON.1 WDCON.2 WDCON.3     DB
        DC      WDCON.4 WDCON.5 WDCON.6 WDCON.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF


DS80C310 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2             EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2                         BF
        C0                                          C3
        C4                                          C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
WDCON   D8                                          DB
        DC                      POR                 DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC                                          EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC                                          FF

        Alternates:

SCON    98                                          9B
        9C                              FE          9F
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS80C310 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80                                        0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD    SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80                    T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
EXIF    0x80    IE5     IE4     IE3     IE2         0x10
        0x08                                        0x01
STATUS  0x80            HIP     LIP                 0x10
        0x08                                        0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01

        Alternates:

PCON    0x80    SMOD_0                              0x10
        0x08                                        0x01


DS80C320/DS80C323 SPECIAL FUNCTION REGISTERS 

   The DS80C320/DS80C323 Special Function Registers are selected
using the .DS80C320 or DS80C323 assembler directives.  


DS80C320/DS80C323 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80              SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      P1      EXIF                        93
        94                                          97
        98      SCON0   SBUF0                       9B
        9C                                          9F
        A0      P2                                  A3
        A4                                          A7
        A8      IE      SADDR0                      AB
        AC                                          AF
        B0      P3                                  B3
        B4                                          B7
        B8      IP      SADEN0                      BB
        BC                                          BF
        C0      SCON1   SBUF1                       C3
        C4              STATUS          TA          C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2                         CF
        D0      PSW                                 D3
        D4                                          D7
        D8      WDCON                               DB
        DC                                          DF
        E0      ACC                                 E3
        E4                                          E7
        E8      EIE                                 EB
        EC                                          EF
        F0      B                                   F3
        F4                                          F7
        F8      EIP                                 FB
        FC                                          FF

        Alternates:

        98      SCON    SBUF                        9B


DS80C320/DS80C323 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
P1      90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON0   98      SCON0.0 SCON0.1 SCON0.2 SCON0.3     9B
        9C      SCON0.4 SCON0.5 SCON0.6 SCON0.7     9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
SCON1   C0      SCON1.0 SCON1.1 SCON1.2 SCON1.3     C3
        C4      SCON1.4 SCON1.5 SCON1.6 SCON1.7     C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
WDCON   D8      WDCON.0 WDCON.1 WDCON.2 WDCON.3     DB
        DC      WDCON.4 WDCON.5 WDCON.6 WDCON.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF

                Alternates:

SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F


DS80C320/DS80C323 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON0   98      RI_0    TI_0    RB8_0   TB8_0       9B
        9C      REN_0   SM2_0   SM1_0   SMO_0       9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2             EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2                         BF
SCON1   C0      RI_1    TI_1    RB8_1   TB8_1       C3
        C4      REN_1   SM2_1   SM1_1   SMO_1       C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
WDCON   D8      RWT     EWT     WTRF    WDIF        DB
        DC      PFI     EPFI    POR     SMOD_1      DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC      EWDI                                EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC      PWDI                                FF

        Alternates:

SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
SCON    98                                          9B
        9C                              FE          9F
SCON0   98                                          9B
        9C                              FE_0        9F
SCON1   C0                                          C3
        C4                              FE_1        C7
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS80C320/DS80C323 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80                                        0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD_0  SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80    WD1     WD0     T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
EXIF    0x80    IE5     IE4     IE3     IE2         0x10
        0x08            RGMD    RGSL    BGS         0x01
STATUS  0x80    PIP     HIP     LIP                 0x10
        0x08                                        0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01

        Alternates:

PCON    0x80    SMOD                                0x10
        0x08                                        0x01


DS80C390 SPECIAL FUNCTION REGISTERS 

   The  DS80C390  Special  Function Registers are selected using
the .DS80C390 assembler directive.  


DS80C390 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80      P4      SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      P1      EXIF    P4CNT   DPX         93
        94              DPX1    C0RMS0  C0RMS1      97
        98      SCON0   SBUF0           ESP         9B
        9C      AP      ACON    C0TMA0  C0TMA1      9F
        A0      P2      P5      P5CNT   C0C         A3
        A4      C0S     C0IR    C0TE    C0RE        A7
        A8      IE      SADDR0  SADDR1  C0M1C       AB
        AC      C0M2C   C0M3C   C0M4C   C0M5C       AF
        B0      P3                      C0M6C       B3
        B4      C0M7C   C0M8C   C0M9C   C0M10C      B7
        B8      IP      SADEN0  SADEN1  C0M11C      BB
        BC      C0M12C  C0M13C  C0M14C  C0M15C      BF
        C0      SCON1   SBUF1                       C3
        C4      PMR     STATUS  MCON    TA          C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2     COR                 CF
        D0      PSW     MCNT0   MCNT1   MA          D3
        D4      MB      MC      C1RMS0  C1RMS1      D7
        D8      WDCON                               DB
        DC                      C1TMA0  C1TMA1      DF
        E0      ACC                     C1C         E3
        E4      C1S     C1IR    C1TE    C1RE        E7
        E8      EIE             MXAX    C1M1C       EB
        EC      C1M2C   C1M3C   C1M4C   C1M5C       EF
        F0      B                       C1M6C       F3
        F4      C1M7C   C1M8C   C1M9C   C1M10C      F7
        F8      EIP                     C1M11C      FB
        FC      C1M12C  C1M13C  C1M14C  C1M15C      FF

        Alternates:

        98      SCON    SBUF                        9B


DS80C390 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
P4      80      P4.0    P4.1    P4.2    P4.3        83
        84      P4.4    P4.5    P4.6    P4.7        87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
P1      90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON0   98      SCON0.0 SCON0.1 SCON0.2 SCON0.3     9B
        9C      SCON0.4 SCON0.5 SCON0.6 SCON0.7     9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
SCON1   C0      SCON1.0 SCON1.1 SCON1.2 SCON1.3     C3
        C4      SCON1.4 SCON1.5 SCON1.6 SCON1.7     C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
WDCON   D8      WDCON.0 WDCON.1 WDCON.2 WDCON.3     DB
        DC      WDCON.4 WDCON.5 WDCON.6 WDCON.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF

                Alternates:

SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F


DS80C390 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
P1      90      T2      T2EX    RXD1    TXD1        93
        94      INT2    INT3    INT4    INT5        97
SCON0   98      RI_0    TI_0    RB8_0   TB8_0       9B
        9C      REN_0   SM2_0   SM1_0   SMO_0       9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2     ES1     EA          AF
P3      B0      RXD0    TXD0    INT0    INT1        B3
        B4      T0      T1                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2     PS1                 BF
SCON1   C0      RI_1    TI_1    RB8_1   TB8_1       C3
        C4      REN_1   SM2_1   SM1_1   SMO_1       C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
WDCON   D8      RWT     EWT     WTRF    WDIF        DB
        DC      PFI     EPFI    POR     SMOD_1      DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC      EWDI    C1IE    C0IE    CANBIE      EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC      PWDI    C1IP    C0IP    CANBIP      FF

        Alternates:

SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
SCON    98                                          9B
        9C                              FE          9F
SCON0   98                                          9B
        9C                              FE_0        9F
SCON1   C0                                          C3
        C4                              FE_1        C7
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS80C390 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80    ID1     ID0     TSL                 0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD_0  SMOD0   OFDF    OFDE        0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80    WD1     WD0     T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
EXIF    0x80    IE5     IE4     IE3     IE2         0x10
        0x08    CKRY    RGMD    RGSL    BGS         0x01
P4CNT   0x80            SBCAN                       0x10
        0x08                                        0x01
ESP     0x80                                        0x10
        0x08                    ESP.1   ESP.0       0x01
ACON    0x80                                        0x10
        0x08            SA      AM1     AM0         0x01
P5      0x80    P5.7    P5.6    P5.5    P5.4        0x10
        0x08    P5.3    P5.2    P5.1    P5.0        0x01
P5CNT   0x80    CAN1BA  CAN0BA  SP1EC   C1_IO       0x10
        0x08    C0_IO   P5CNT.2 P5CNT.1 P5CNT.0     0x01
CxC     0x80    ERIE    STIE    PDE     SIESTA      0x10
        0x08    CRST    AUTOB   ERCS    SWINT       0x01
CxS     0x80    BSS   EC96_128  WKS     RXS         0x10
        0x08    TXS     ER2     ER1     ER0         0x01
CxIR    0x80    INTIN7  INTIN6  INTIN5  INTIN4      0x10
        0x08    INTIN3  INTIN2  INTIN1  INTIN0      0x01
CxCxxC  0x80    MSRDY   ET1     ER1     INTRQ       0x10
        0x08    EXTRQ   MTRQ    ROW_TIH DTUP        0x01
PMR     0x80    CD1     CD0     SWB     CTM         0x10
        0x08    4X_2X   ALEOFF                      0x01
STATUS  0x80    PIP     HIP     LIP                 0x10
        0x08    SPTA1   SPRA1   SPTA0   SPRA0       0x01
MCON    0x80    IDM1    IDM0    CMA                 0x10
        0x08    PDCE3   PDCE2   PDCE1   PDCE0       0x01
T2MOD   0x80                            D13T1       0x10
        0x08    D13T2           T2OE    DCEN        0x01
COR     0x80    IRDACK  C1BPR7  C1BPR6  C0BPR7      0x10
        0x08    C0BPR6  COD1    COD0    CLKOE       0x01
MCNT0   0x80    _LSHIFT CSE     SCB     MAS4        0x10
        0x08    MAS3    MAS2    MAS1    MAS0        0x01
MCNT1   0x80    MST     MOF             CLM         0x10
        0x08                                        0x01

        Alternates:

PCON    0x80    SMOD                                0x10
        0x08                                        0x01


DS83C520/DS87C520 SPECIAL FUNCTION REGISTERS 


   The DS83C520/DS87C520 Special Function Registers are selected
using the .DS83C520 or DS87C520 assembler directives.  


DS83C520/DS87C520 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80      P0      SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      PORT1   EXIF                        93
        94                                          97
        98      SCON0   SBUF0                       9B
        9C                                          9F
        A0      P2                                  A3
        A4                                          A7
        A8      IE      SADDR0  SADDR1              AB
        AC                                          AF
        B0      P3                                  B3
        B4                                          B7
        B8      IP      SADEN0  SADEN1              BB
        BC                                          BF
        C0      SCON1   SBUF1   ROMSIZE             C3
        C4      PMR     STATUS          TA          C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2                         CF
        D0      PSW                                 D3
        D4                                          D7
        D8      WDCON                               DB
        DC                                          DF
        E0      ACC                                 E3
        E4                                          E7
        E8      EIE                                 EB
        EC                                          EF
        F0      B                                   F3
        F4                                          F7
        F8      EIP                                 FB
        FC                                          FF

        Alternates:

        98      SCON    SBUF                        9B


DS83C520/DS87C520 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
P0      80      P0.7    P0.6    P0.5    P0.4        83
        84      P0.3    P0.2    P0.1    P0.0        87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
PORT1   90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON0   98      SCON0.0 SCON0.1 SCON0.2 SCON0.3     9B
        9C      SCON0.4 SCON0.5 SCON0.6 SCON0.7     9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
SCON1   C0      SCON1.0 SCON1.1 SCON1.2 SCON1.3     C3
        C4      SCON1.4 SCON1.5 SCON1.6 SCON1.7     C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
WDCON   D8      WDCON.0 WDCON.1 WDCON.2 WDCON.3     DB
        DC      WDCON.4 WDCON.5 WDCON.6 WDCON.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF

                Alternates:

PORT1   90      PORT1.0 PORT1.1 PORT1.2 PORT1.3     93
        94      PORT1.4 PORT1.5 PORT1.6 PORT1.7     97
SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F


DS83C520/DS87C520 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON0   98      RI_0    TI_0    RB8_0   TB8_0       9B
        9C      REN_0   SM2_0   SM1_0   SMO_0       9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2     ES1     EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2     PS1                 BF
SCON1   C0      RI_1    TI_1    RB8_1   TB8_1       C3
        C4      REN_1   SM2_1   SM1_1   SMO_1       C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
WDCON   D8      RWT     EWT     WTRF    WDIF        DB
        DC      PFI     EPFI    POR     SMOD_1      DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC      EWDI                                EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC      PWDI                                FF

        Alternates:

SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
SCON    98                                          9B
        9C                              FE          9F
SCON0   98                                          9B
        9C                              FE_0        9F
SCON1   C0                                          C3
        C4                              FE_1        C7
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS83C520/DS87C520 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80                                        0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD_0  SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80    WD1     WD0     T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
EXIF    0x80    IE5     IE4     IE3     IE          0x10
        0x08    XT_RG   RGMD    RGSL    BGS         0x01
SBUF1   0x80    SB7     SB6     SB5     SB4         0x10
        0x08    SB3     SB2     SB1     SB0         0x01
ROMSIZE 0x80                                        0x10
        0x08            RMS2    RMS1    RMS0        0x01
PMR     0x80    CD1     CD0     SWB                 0x10
        0x08    XTOFF   ALEOFF  DME1    DME0        0x01
STATUS  0x80    PIP     HIP     LIP     XTUP        0x10
        0x08    SPTA1   SPRA1   SPTA0   SPRA0       0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01

        Alternates:

PCON    0x80    SMOD                                0x10
        0x08                                        0x01


DS83C530/DS87C530 SPECIAL FUNCTION REGISTERS 


   The DS83C530/DS87C530 Special Function Registers are selected
using the .DS83C530 or DS87C530 assembler directives.  


DS83C530/DS87C530 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80      P0      SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      P1      EXIF                        93
        94                      TRIM                97
        98      SCON0   SBUF0                       9B
        9C                                          9F
        A0      P2                                  A3
        A4                                          A7
        A8      IE      SADDR0  SADDR1              AB
        AC                                          AF
        B0      P3                                  B3
        B4                                          B7
        B8      IP      SADEN0  SADEN1              BB
        BC                                          BF
        C0      SCON1   SBUF1   ROMSIZE             C3
        C4      PMR     STATUS          TA          C7
        C8      T2CON   T2MOD   RCAP2L  RCAP2H      CB
        CC      TL2     TH2                         CF
        D0      PSW                                 D3
        D4                                          D7
        D8      WDCON                               DB
        DC                                          DF
        E0      ACC                                 E3
        E4                                          E7
        E8      EIE                                 EB
        EC                                          EF
        F0      B               RTASS   RTAS        F3
        F4      RTAM    RTAH                        F7
        F8      EIP     RTCC    RTCSS   RTCS        FB
        FC      RTCM    RTCH    RTCD0   RTCD1       FF

        Alternates:

        98      SCON    SBUF                        9B


DS83C530/DS87C530 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
P0      80      P0.7    P0.6    P0.5    P0.4        83
        84      P0.3    P0.2    P0.1    P0.0        87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
P1      90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON0   98      SCON0.0 SCON0.1 SCON0.2 SCON0.3     9B
        9C      SCON0.4 SCON0.5 SCON0.6 SCON0.7     9F
P2      A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
P3      B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
SCON1   C0      SCON1.0 SCON1.1 SCON1.2 SCON1.3     C3
        C4      SCON1.4 SCON1.5 SCON1.6 SCON1.7     C7
T2CON   C8      T2CON.0 T2CON.1 T2CON.2 T2CON.3     CB
        CC      T2CON.4 T2CON.5 T2CON.6 T2CON.7     CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
WDCON   D8      WDCON.0 WDCON.1 WDCON.2 WDCON.3     DB
        DC      WDCON.4 WDCON.5 WDCON.6 WDCON.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF

                Alternates:

SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F


DS83C530/DS87C530 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON0   98      RI_0    TI_0    RB8_0   TB8_0       9B
        9C      REN_0   SM2_0   SM1_0   SMO_0       9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2     ES1     EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PT2     PS1                 BF
SCON1   C0      RI_1    TI_1    RB8_1   TB8_1       C3
        C4      REN_1   SM2_1   SM1_1   SMO_1       C7
T2CON   C8      CPRL2   CT2     TR2     EXEN2       CB
        CC      TCLK    RCLK    EXF2    TF2         CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
WDCON   D8      RWT     EWT     WTRF    WDIF        DB
        DC      PFI     EPFI    POR     SMOD_1      DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC      EWDI    ERTCI                       EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC      PWDI    PRTCI                       FF

        Alternates:

SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
SCON    98                                          9B
        9C                              FE          9F
SCON0   98                                          9B
        9C                              FE_0        9F
SCON1   C0                                          C3
        C4                              FE_1        C7
T2CON   C8      CP_RL2  C_T2                        CB
        CC                                          CF


DS83C530/DS87C530 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80                                        0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD_0  SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80    WD1     WD0     T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
EXIF    0x80    IE5     IE4     IE3     IE          0x10
        0x08    XT_RG   RGMD    RGSL    BGS         0x01
TRIM    0x80    E4K     X12_6   TRM2    _TRM2       0x10
        0x08    TRM1    _TRM1   TRM0    _TRM0       0x01
SBUF1   0x80    SB7     SB6     SB5     SB4         0x10
        0x08    SB3     SB2     SB1     SB0         0x01
ROMSIZE 0x80                                        0x10
        0x08            RMS2    RMS1    RMS0        0x01
PMR     0x80    CD1     CD0     SWB                 0x10
        0x08    XTOFF   ALEOFF  DME1    DME0        0x01
STATUS  0x80    PIP     HIP     LIP     XTUP        0x10
        0x08    SPTA1   SPRA1   SPTA0   SPRA0       0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01
RTCC    0x80    SSCE    SCE     MCE     HCE         0x10
        0x08    RTCRE   RTCWE   RTCIF   RTCE        0x01

        Alternates:

PCON    0x80    SMOD                                0x10
        0x08                                        0x01


DS83C550/DS87C550 SPECIAL FUNCTION REGISTERS 

   The DS83C550/DS87C550 Special Function Registers are selected
using the .DS83C550 or DS87C550 assembler directives.  


DS83C550/DS87C550 SPECIAL FUNCTION REGISTERS 
SFR Map 

                --------- 4 Bytes ----------
                ----    ----    ----    ----
        80      PORT0   SP      DPL     DPH         83
        84      DPL1    DPH1    DPS     PCON        87
        88      TCON    TMOD    TL0     TL1         8B
        8C      TH0     TH1     CKCON               8F
        90      PORT1   RCON                        93
        94                                          97
        98      SCON0   SBUF0                       9B
        9C                              PMR         9F
        A0      PORT2   SADDR0  SADDR1              A3
        A4                                          A7
        A8      IE      CMPL0   CMPL1   CMPL2       AB
        AC      CPTL0   CPTL1   CPTL2   CPTL3       AF
        B0      PORT3           ADCON1  ADCON2      B3
        B4      ADMSB   ADLSD   WINHI   WINLO       B7
        B8      IP      SADEN0  SADEN1              BB
        BC                      T2CON   T2MOD       BF
        C0      PORT4           ROMSIZE             C3
        C4      PORT5   STATUS          TA          C7
        C8      T2IR    CMPH0   CMPH1   CMPH2       CB
        CC      CPTH0   CPTH1   CPTH2   CPTH3       CF
        D0      PSW             PW0FG   PW1FG       D3
        D4      PW2FG   PW3FG   PWMADR              D7
        D8      SCON1   SBUF1                       DB
        DC      PWM0    PWM1    PWM2    PWM3        DF
        E0      ACC     PW01CS  PW23CS  PW01CON     E3
        E4      PW23CON         RLOADL  RLOADH      E7
        E8      EIE             T2SEL   CTCON       EB
        EC      TL2     TH2     SETR    RSTR        EF
        F0      B       PORT6                       F3
        F4                                          F7
        F8      EIP                                 FB
        FC                              WDCON       FF

        Alternates:

        80      P0                                  83
        90      P1                                  93
        98      SCON    SBUF                        9B
        A0      P2                                  A3
        B0      P3                                  B3
        C0      P4                                  C3
        C4      P5                                  C7
        F0              PORT6                       F3


DS83C550/DS87C550 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Generic 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
PORT0   80      P0.7    P0.6    P0.5    P0.4        83
        84      P0.3    P0.2    P0.1    P0.0        87
TCON    88      TCON.0  TCON.1  TCON.2  TCON.3      8B
        8C      TCON.4  TCON.5  TCON.6  TCON.7      8F
PORT1   90      P1.0    P1.1    P1.2    P1.3        93
        94      P1.4    P1.5    P1.6    P1.7        97
SCON0   98      SCON0.0 SCON0.1 SCON0.2 SCON0.3     9B
        9C      SCON0.4 SCON0.5 SCON0.6 SCON0.7     9F
PORT2   A0      P2.0    P2.1    P2.2    P2.3        A3
        A4      P2.4    P2.5    P2.6    P2.7        A7
IE      A8      IE.0    IE.1    IE.2    IE.3        AB
        AC      IE.4    IE.5    EI.6    IE.7        AF
PORT3   B0      P3.0    P3.1    P3.2    P3.3        B3
        B4      P3.4    P3.5    P3.6    P3.7        B7
IP      B8      IP.0    IP.1    IP.2    IP.3        BB
        BC      IP.4    IP.5    IP.6    IP.7        BF
PORT4   C0      P4.0    P4.1    P4.2    P4.3        C3
        C4      P4.4    P4.5    P4.6    P4.7        C7
T2IR    C8      T2IR.0  T2IR.1  T2IR.2  T2IR.3      CB
        CC      T2IR.4  T2IR.5  T2IR.6  T2IR.7      CF
PSW     D0      PSW.0   PSW.1   PSW.2   PSW.3       D3
        D4      PSW.4   PSW.5   PSW.6   PSW.7       D7
SCON1   D8      SCON1.0 SCON1.1 SCON1.2 SCON1.3     DB
        DC      SCON1.4 SCON1.5 SCON1.6 SCON1.7     DF
ACC     E0      ACC.0   ACC.1   ACC.2   ACC.3       E3
        E4      ACC.4   ACC.5   ACC.6   ACC.7       E7
EIE     E8      EIE.0   EIE.1   EIE.2   EIE.3       EB
        EC      EIE.4   EIE.5   EIE.6   EIE.7       EF
B       F0      B.0     B.1     B.2     B.3         F3
        F4      B.4     B.5     B.6     B.7         F7
EIP     F8      EIP.0   EIP.1   EIP.2   EIP.3       FB
        FC      EIP.4   EIP.5   EIP.6   EIP.7       FF

                Alternates:

PORT0   80      PORT0.7 PORT0.6 PORT0.5 PORT0.4     83
        84      PORT0.3 PORT0.2 PORT0.1 PORT0.0     87
PORT1   90      PORT1.0 PORT1.1 PORT1.2 PORT1.3     93
        94      PORT1.4 PORT1.5 PORT1.6 PORT1.7     97
SCON    98      SCON.0  SCON.1  SCON.2  SCON.3      9B
        9C      SCON.4  SCON.5  SCON.6  SCON.7      9F
PORT2   A0      PORT2.0 PORT2.1 PORT2.2 PORT2.3     A3
        A4      PORT2.4 PORT2.5 PORT2.6 PORT2.7     A7
PORT3   B0      PORT3.0 PORT3.1 PORT3.2 PORT3.3     B3
        B4      PORT3.4 PORT3.5 PORT3.6 PORT3.7     B7
PORT4   C0      PORT4.0 PORT4.1 PORT4.2 PORT4.3     C3
        C4      PORT4.4 PORT4.5 PORT4.6 PORT4.7     C7


DS83C550/DS87C550 SPECIAL FUNCTION REGISTERS 
Bit Addressable Registers:  Specific 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
        80                                          83
        84                                          87
TCON    88      IT0     IE0     IT1     IE1         8B
        8C      TR0     TF0     TR1     TF1         8F
        90                                          93
        94                                          97
SCON0   98      RI_0    TI_0    RB8_0   TB8_0       9B
        9C      REN_0   SM2_0   SM1_0   SMO_0       9F
        A0                                          A3
        A4                                          A7
IE      A8      EX0     ET0     EX1     ET1         AB
        AC      ES0     ET2     ES1     EA          AF
        B0                                          B3
        B4                                          B7
IP      B8      PX0     PT0     PX1     PT1         BB
        BC      PS0     PS1     PAD                 BF
PORT4   C0      CMSR0   CMSR1   CMSR2   CMSR3       C3
        C4      CMSR4   CMSR5   CMT0    CMT1        C7
T2IR    C8      CF0     CF1     CF2     CF3         CB
        CC      CM0F    CM1F    CM2F                CF
PSW     D0      P       FL      OV      RS0         D3
        D4      RS1     F0      AC      CY          D7
SCON1   D8      RI_1    TI_1    RB8_1   TB8_1       DB
        DC      REN_1   SM2_1   SM1_1   SMO_1       DF
        E0                                          E3
        E4                                          E7
EIE     E8      EX2     EX3     EX4     EX5         EB
        EC      ECM0    ECM1    ECM2    ET2         EF
        F0                                          F3
        F4                                          F7
EIP     F8      PX2     PX3     PX4     PX5         FB
        FC      PCM0    PCM1    PCM2    PT2         FF

        Alternates:

SCON    98      RI      TI      RB8     TB8         9B
        9C      REN     SM2     SM1     SMO         9F
SCON    98                                          9B
        9C                              FE          9F
SCON0   98                                          9B
        9C                              FE_0        9F
T2IR    C8      IE2     IE3     IE4     IE5         CB
        CC                                          CF
SCON1   D8                                          DB
        DC                              FE_1        DF
EIE     E8      EC0     EC1     EC2     EC3         EB
        EC                                          EF
EIP     F8      PC0     PC1     PC2     PC3         FB
        FC                                          FF


DS83C550/DS87C550 SPECIAL FUNCTION REGISTERS 
Optional Symbols:  Control Bits 

                ---------- 4 BITS ----------
                ----    ----    ----    ----
                0x80    0x40    0x20    0x10
                0x08    0x04    0x02    0x10
                ----    ----    ----    ----
DPS     0x80    ID1     ID0     TSL                 0x10
        0x08                            SEL         0x01
PCON    0x80    SMOD_0  SMOD0                       0x10
        0x08    GF1     GF0     STOP    IDLE        0x01
TMOD    0x80    T1GATE  T1C_T   T1M1    T1M0        0x10
        0x08    T0GATE  T0C_T   T0M1    T0M0        0x01
CKCON   0x80    WD1     WD0     T2M     T1M         0x10
        0x08    T0M     MD2     MD1     MD0         0x01
RCON    0x80                                        0x10
        0x08    CKRDY   RGMD    RGSL    BGS         0x01
PMR     0x80    CD1     CD0     SWB     CTM         0x10
        0x08    4X_2X   ALEOFF  DEM1    DEM0        0x01
ADCON1  0x80   STRT_BSY EOC     CONT_SS ADEX        0x10
        0x08    WCQ     WCM     ADON    WCIO        0x01
ADCON2  0x80    OUTCF   MUX2    MUX1    MUX0        0x10
        0x08    APS3    APS2    APS1    APS0        0x01
T2CON   0x80    TF2     EXF2    RCLK    TCLK        0x10
        0x08    EXEN2   TR2     CT2     CPRL2       0x01
T2MOD   0x80                                        0x10
        0x08                    T2OE    DCEN        0x01
PORT5   0x80    ADC7    ADC6    ADC5    ADC4        0x10
        0x08    ADC3    ADC2    ADC1    ADC0        0x01
ROMSIZE 0x80                                        0x10
        0x08            RMS2    RMS1    RMS0        0x01
STATUS  0x80    PIP     HIP     LIP     XTUP        0x10
        0x08    SPTA1   SPRA1   SPTA0   SPRA0       0x01
PWMADR  0x80    ADRS                                0x10
        0x08                    PWE1    PWE0        0x01
PW01CS  0x80    PW0S2   PW0S1   PW0S0   PW0EN       0x10
        0x08    PW1S2   PW1S1   PW1S0   PW1EN       0x01
PW23CS  0x80    PW2S2   PW2S1   PW2S0   PW2EN       0x10
        0x08    PW3S2   PW3S1   PW3S0   PW3EN       0x01
PW01CON 0x80    PW0F    PW0DC   PW0OE   PW0T_C      0x10
        0x08    PW1F    PW1DC   PW1OE   PW1T_C      0x01
PW23CON 0x80    PW2F    PW2DC   PW2OE   PW2T_C      0x10
        0x08    PW3F    PW3DC   PW3OE   PW3T_C      0x01
T2SEL   0x80    TF2S    TF2BS           TF2B        0x10
        0x08                    T2P1    T2P0        0x01
CTCON   0x80    _CT3    CT3     _CT2    CT2         0x10
        0x08    _CT1    CT1     _CT0    CT0         0x01
SETR    0x80    TGFF1   TGFF0   CMS5    CMS4       0x10
        0x08    CMS3    CMS2    CMS1    CMS0        0x01
RSTR    0x80    CMTE1   CMTE0   CMR5    CMR4        0x10
        0x08    CMR3    CMR2    CMR1    CMR0        0x01
PORT6   0x80    STADC           PWMC1   PWMC0       0x10
        0x08    PWMO3   PWMO2   PWMO1   PWMO0       0x01
WDCON   0x80    SMOD_1  POR     EPF1    PF1         0x10
        0x08    WDIF    WTRF    EWT     RWT         0x01

        Alternates:

PCON    0x80    SMOD                                0x10
        0x08                                        0x01
T2CON   0x80                                        0x10
        0x08                    C_T2    _RL2        0x01

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Last Updated: April 2009