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ASF2MC8 Assembler

PROCESSOR SPECIFIC DIRECTIVES 


   The ASF2MC8 assembler supports the F2MC8L and F2MC8FX proces-
sor cores.  


.8L Directive 

Format:  

        .8L 

The  .8L  directive selects the F2MC8L processor cycle counts to
be listed when the -c option is specified.  This is the  default
selection  if  no processor directive is specified in the source
assemby file.  


.8FX Directive 

Format:  

        .8FX 

The .8FX directive selects the F2MC8FX processor cycle counts to
be listed when the -c option is specified.  .8L is  the  default
selection  if  no processor directive is specified in the source
assemby file.  



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  ASF2MC8
assembler:  

        Processor Type            .__.CPU. Value
        --------------            --------------
            .8L                          0
            .8FX                         1


   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.  


F2MC8L/F2MC8FX REGISTERS 

   The  following  is a list of register designations recognized
by the ASF2MC8 assembler:  

        pc              -       Program Counter

        a               -       Accumulator

        t               -       Temporary Accumulator

        ix              -       Index Register

        ep              -       Extra Pointer

        sp              -       Stack Pointer

        ps              -       Program Status

        r0,r1,r2,r3,    -       Memory Registers
        r4,r5,r6,r7             32 banks of
                                8 registers each


F2MC8L/F2MC8FX INSTRUCTION SET 

   The  following  list specifies the format for each addressing
mode supported by ASF2MC8:  

        #data           immediate data
                        byte or word data

        *dir            direct page addressing

        *dir:b          bit addressing to a
                        direct page address

        ext             extended addressing

        a,t             register addressing
        pc,sp,ix,ep

        @a              accumulator indexed

        @ix+d           indexed addressing
                        plus offset

        @ix             indexed addressing
                        with a zero offset

        @ep             pointer addressing

        r               General-purpose registers

        label           call/jmp/branch label

The  terms  data,  dir,  ext, b, d, and label may all be expres-
sions.  

   Note  that  not all addressing modes are valid with every in-
struction, refer to the F2MC8L/F2MC8FX technical data for  valid
modes.  

   The following tables list all F2MC8L/F2MC8FX mnemonics recog-
nized by the ASF2MC8 assembler.  The designation [] refers to  a
required addressing mode argument.  



Transfer Instructions 

        mov     [],[]           movw    [],[]
        xch     [],[]           xchw    [],[]
        clrb    []              setb    []
        swap    []


Operation Instructions 

        addc    a(,[])          addcw   a
        subc    a(,[])          subcw   a
        inc     r               incw    []
        dec     r               decw    []
        mulu    a               divu    a
        and     a(,[])          andw    a
        cmp     a(,[])          cmpw    a
        or      a(,[])          orw     a
        xor     a(,[])          xorw    a
        rolc    a               rorc    a
        daa                     das


Branch/Jump/Call Instructions 

        bz      label           bew     label
        bnz     label           bne     label
        bc      label           blo     label
        bnc     label           bhs     label
        bn      label           bp      label
        blt     label           bge     label
        bbc     *dir:b,label    bbs     *dir:b,label
        jmp     []              call    label
        callv   #data           xchw    a,pc
        ret                     reti


Other Instructions 

        pushw   []              popw    []
        nop
        clrc                    setc
        clri                    seti

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Last Updated: April 2009