AS8048 supports the 8048, 8041, 8022, and 8021 variations of the 8048 microprocessor family.
PROCESSOR SPECIFIC DIRECTIVES
.8048 DIRECTIVE
Format:
.8048
The .8048 directive enables processing of only the 8048 specific
mnemonics. 8041/8022/8021 mnemonics encountered will be flagged
with an <o> error.
.8041 DIRECTIVE
Format:
.8041
The .8041 directive enables processing of the 8041 specific
mnemonics. 8041 mnemonics encountered without the .8041 direc-
tive will be flagged with an <o> error.
.8022 DIRECTIVE
Format:
.8022
The .8022 directive enables processing of the 8022 specific
mnemonics. 8022 mnemonics encountered without the .8022 direc-
tive will be flagged with an <o> error.
.8021 DIRECTIVE
Format:
.8021
The .8021 directive enables processing of the 8021 specific
mnemonics. 8021 mnemonics encountered without the .8021 direc-
tive will be flagged with an <o> error.
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 AS8048
assembler:
Processor Type .__.CPU. Value
-------------- --------------
.8048 0
.8041 1
.8022 2
.8021 3
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.
8048 REGISTER SET
The following is a list of the 8048 registers used by AS8048:
a - 8-bit accumulator
r0,r1,r2,r3 - 8-bit registers
r4,r5,r6,r7
bus,p1,p2 - bus and ports
p4,p5,p6,p7
an0,an1 - analog input select
rb0,rb1 - register bank select
mb0,mb1 - memory bank select
c - carry (bit in status word)
clk - timer
cnt - counter
dbb - data bus buffer
f0 - f0 bit in psw
f1 - f1 bit in psw
i - interrupt
psw - program status word
t - timer register
tcnt - timer counter
tcnti - timer interrupt
8048 INSTRUCTION SET
The following tables list all 8048 mnemonics recognized by
the AS8048 assembler. The following list specifies the format
for each addressing mode supported by AS8048:
#data immediate data
byte or word data
r register r0,r1
rn register r0,r1,r2,r3,r4,r5,r6, or r7
@r indirect on register r0 or r1
@a indirect on accumulator
addr direct memory address
addr8 current page 8-bit jmp address
#data immediate data
pn ports p1 or p2
port ports p1,p2 or bus
ep ports p4,p5,p6, or p7
bus i/o bus
s f0 or f1 bits in psw
bitaddr bit address
label call or jump label
The terms data, addr, and label may all be expressions.
Note that not all addressing modes are valid with every in-
struction. Refer to the 8048, 8041, 8022, and 8021 technical
data for valid modes.
Alphabetical Instruction Listing
8021 8022 8041 8048
add a,@r x x x x
add a,#data x x x x
add a,rn x x x x
addc a,@r x x x x
addc a,#data x x x x
addc a,rn x x x x
anl port,#data x x
anl bus,#data x
anl a,@r x x x x
anl a,rn x x x x
anld ep,a x x x x
call addr x x x x
clr a x x x x
clr c x x x x
clr s x x
cpl a x x x x
cpl c x x x x
cpl s x x
daa a x x x x
dec rn x x
dec a x x x x
dis tcnti x x
dis i x x
djnz rn,addr8 x x x x
en tcnti x x
en i x x
ent0 clk x
8021 8022 8041 8048
in a,dbb x
in a,pn x x x x
inc a x x x x
inc a,@r x x
inc rn x x x x
ins a,bus x
jmp addr x x x x
jmpp @a x x x x
jb0 addr8 x x
jb1 addr8 x x
jb2 addr8 x x
jb3 addr8 x x
jb4 addr8 x x
jb5 addr8 x x
jb6 addr8 x x
jb7 addr8 x x
jc addr8 x x x x
jf0 addr8 x x
jf1 addr8 x x
jnc addr8 x x x x
jni addr8 x
jnibf addr8 x
jnt0 addr8 x x
jnt1 addr8 x x
jnz addr8 x x x x
jobf addr8 x
jtf addr8 x x x x
jt0 addr8 x x
jt1 addr8 x x x x
jz addr8 x x x x
8021 8022 8041 8048
mov a,#data x x x x
mov a,psw x x
mov a,@r x x x x
mov a,rn x x x x
mov a,t x x x x
mov psw,a x x
mov rn,a x x x x
mov @r,a x x x x
mov rn,#data x x x x
mov @r,#data x x x x
mov t,a x x x x
movd a,ep x x x x
movd ep,a x x x
movp a,@a x x x x
movp3 a,@a x x
movx a,@r x
movx @r,a x
nop x x x
orl a,#data x x x x
orl a,rn x x x x
orl a,@r x x x x
orl bus,#data x
orl port,#data x x
orld ep,a x x x x
out dbb,a x
outl bus,a x
outl port,a x x x x
rad a x
ret x x x x
retr x x
8021 8022 8041 8048
rl a x x x x
rlc a x x x x
rr a x x x x
rrc a x x x x
sel an0 x
sel an1 x
sel mb0 x
sel mb1 x
sel rb0 x
sel rb1 x
swap a x x x x
stop tcnt x x x x
strt cnt x x x x
strt t x x x x
xch a,@r x x x x
xchd a,@r x x x x
xrl a,@r x x x x
xrl a,#data x x x x
xch a,rn x x x x
xrl a,rn x x x x
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Last Updated: September 2023