Requires the .setdp directive to specify the ram area.
6804 REGISTER SET
The following is a list of the 6804 registers used by AS6804:
x,y - index registers
6804 INSTRUCTION SET
The following tables list all 6804 mnemonics recognized by
the AS6804 assembler. The designation [] refers to a required
addressing mode argument. The following list specifies the
format for each addressing mode supported by AS6804:
#data immediate data
byte or word data
,x register indirect addressing
dir direct addressing
(see .setdp directive)
0 <= dir <= 255
ext extended addressing
label branch label
The terms data, dir, and ext may be expressions. The label for
the short branchs beq, bne, bcc, and bcs must not be external.
Note that not all addressing modes are valid with every in-
struction, refer to the 6804 technical data for valid modes.
Inherent Instructions
coma decx
decy incx
incy rola
rti rts
stop tax
tay txa
tya wait
Branch Instructions
bne label beq label
bcc label bcs label
Single Operand Instructions
add []
and []
cmp []
dec []
inc []
lda []
sta []
sub []
Jump and Jump to Subroutine Instructions
jsr []
jmp []
Bit Test Instructions
brclr #data,[],label
brset #data,[],label
bclr #label,[]
bset #label,[]
Load Immediate data Instruction
mvi [],#data
6804 Derived Instructions
asla
bam label
bap label
bxmi label
bxpl label
bymi label
bypl label
clra
clrx
clry
deca
decx
decy
inca
incx
incy
ldxi #data
ldyi #data
nop
tax
tay
txa
tya
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