The ASF8 assembler supports the F8 and 3870 processor cores.
F8 REGISTERS
The following is a list of register designations recognized
by the ASF8 assembler:
r0-r11 - Registers
j - Scratch Pad Register r9
hu - MSB of register H the
Data Counter Buffer Register
Scratch Pad Register r10
hl - LSB of register H the
Data Counter Buffer Register
Scratch Pad Register r11
ku - MSB of register K the
Stack Buffer Register
kl - LSB of register K the
Stack Buffer Register
qu - MSB of register Q a
Buffer Register for the
Data Counter or Program Counter
ql - LSB of register Q a
Buffer Register for the
Data Counter or Program Counter
a - Accumulator
is - Scratch Pad Address Register (ISAR)
w - Status Register
s - Register Addressed
by is (unchanged)
i - Register Addressed
by is (incremented)
d - Register Addressed
by is (decremented)
pc0 - Program Counter
or p0, pc
pc1 - Program Counter Buffer or
or p1, p Stack Register
dc0 - Data Counter
or d0, dc
F8 INSTRUCTION SET
The following list specifies the format for each addressing
mode supported by ASF8:
#nibble immediate 4-Bit data
#byte immediate 8-Bit data
#word immediate 16-Bit data
#t3 3-Bit test condition
[Zero Carry Sign]
#t4 4-Bit test condition
[Overflow Zero Carry Sign]
r register r0-r11 addressing and
indirect addressing s, i, and d
j is equivalent to r9
hu (MSB of h) is equivalent to r10
hl (LSB of h) is equivalent to r11
ku and kl MSB and LSB of k register
qu and ql MSB and LSB of q register
h, k, or q 16-Bit registers
p0, pc0, or pc
p1 or p
d0, dc0, or dc
w status register
is Indirect Scratchpad Address Register
label call/jmp/branch label
The terms nibble, byte, word, t3, t4, and label may all be ex-
pressions.
The following tables list all F8 mnemonics recognized by the
ASF8 assembler.
Accumulator Group Instructions
lnk ai #byte
ni #byte clr
ci #byte com
xi #byte inc
li #byte lis #nibble
oi #byte sl 1
sl 4 sr 1
sr 4
ranch Instructions
bc label bp label
bz label bt #t3,label
bm label bnc label
bno label bnz label
bf #t4,label br7 label
br label jmp label
Memory Reference Instructions
am amd
nm cm
xm lm
om st
Address Register Instructions
adc pk
pi #word xdc
lr dc,q lr dc,h
dci #word lr p0,q
lr p,k pop
lr q,dc lr h,dc
lr k,p
Scratchpad Register Instructions
as r asd r
ds r
lr a,r
lr a,ku lr a,kl
lr a,qu lr a,ql
lr r,a
lr ku,a lr kl,a
lr qu,a lr ql,a
ns r xs r
Miscellaneous Instructions
di ei
in #byte ins #nibble
out #byte outs #nibble
lr is,a lr a,is
lr w,j lr j,w
lisl #0-#7 lisu #0-#7
nop
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