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INSTRUCTION SET
Example: Assume program
counter
contents have been stacked in
locations 22-23.
XCHNIB: MOV
RO,#23
;MOVE '23' DEC
TO
REG 0
CLR A ;CLEAR
ACC
TO
ZEROS
XCHD
A,@RO
;EXCHANGE BITS 0-3 OF
ACC
;AND
LOCATION
23
(BITS
8-11
;OF PC ARE ZEROED, ADDRESS
;REFERS
TO
PAGE
0)
XRL A,R
r
Logical XOR Accumulator With Register Mask
1110111rrri
Data in the
accumulator
in EXCLUSIVE ORed with the mask
contained in
working
register 'r'.
(A)
.... (A) XOR (Rr)
Example: XORREG: XRL A,R5
r=0-7
;'XOR'
ACC
CONTENTS WITH
;MASK IN
REG 5
XRL
A,@R
r
Logical XOR Accumulator With Memory Mask
111011000rl
Data in the
accumulator
is
EXCLUSIVE ORed with the mask
contained in the data memory location addressed by
register 'r', bits
0-5~
(A)
....
(A) XOR ((Rr)) r=0-1
Example: XORDM: MOV
R1,
#20H ;MOVE '20' HEX TO REG 1
XRL A,@R1
;'XOR'
ACC
CONTENTS WITH MASK
;IN
LOCATION
32
XRL A,#data Logical XOR Accumulator With Immediate Mask
11
1 0 1 1 0 0 1 1 1 1 d7 de ds d4 I d3 d2
d1
do I
This is a 2-cycle instruction. Data in the
accumulator
is EXCLUSIVE ORed with
an
immediately'-specified mask.
(A)
.... (A) XOR data
Example: XORID: XOR A,#HEXTEN ;XOR
CONTENTS
OF ACC WITH
;MASK
EQUAL VALUE OF SYMBOL
;'HEXTEN'
Mnemonics copyright Intel Corporation 1976.
·0-6
for
8039/8049
4-36