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XOR
EXCLUSIVE
OR
XOR
Encoding:
Memory or Register Operand with Register Operand:
1 0 0 1 1 0 0 d w 1 mod reg rIm 1
if
d = 1
then
LSRC = REG, RSRC = EA, DEST =
REG
else
LSRC = EA, RSRC = REG, DEST = EA
Immediate Operand to Memory or Register Operand:
11
000000
w 1 mod
11
0 rIm 1
data data if
w=1
LSRC = EA, RSRC = data, DEST = EA
Immediate Operand to Accumulator:
1 0 0 1 1 0 1 0 w 1 data 1 data
if
w=1
I
if w = 0
then
LSRC = AL, RSRC = data, DEST =
AL
else
LSRC = AX, RSRC = data, DEST = AX
XOR
Operands Clocks· Transfers
Bytes
XOR
Coding
Example
register, register
3
-
2
XORCX,
BX
register, memory
9(13)+
EA
1
2-4
XOR
Cl,
MASK_BYTE
memory,
register
16(24)+
EA
2
2-4
XOR
ALPHA
[SI],
DX
accumulator, immediate
4
-
2-3
XOR
Al,
01000010B
register, immediate
4
-
3-4
XOR
SI,
00C2H
memory,
immediate
17(25)
+
EA
2
3-6
XOR
RETURN_CODE,
OD2H
*b(w):
where
b denotes the number
of
clock cycles for byte operands
and
w denotes the number of clock cycles for
word
operands.
2-165