PM Opc XOR

From SublabWiki
Revision as of 20:05, 17 April 2009 by JustBurn (talk | contribs) (Conditions)
Jump to: navigation, search

XOR = Logical Exclusive-OR

Hex Mnemonic Cycles
38 XOR A, A 8
39 XOR A, B 8
3A nn XOR A, #nn 8
3B XOR A, [HL] 8
3C nn XOR A, [N+#nn] 12
3D nn nn XOR A, [#nnnn] 16
3E XOR A, [X] 8
3F XOR A, [Y] 8
9E nn XOR F, #nn 12
CE B8 nn XOR B, #nn 12
CE B9 nn XOR L, #nn 12
CE BA nn XOR H, #nn 12
DA nn nn XOR [N+#nn], #nn 20
CE 38 ss XOR A, [X+#ss] 16
CE 39 ss XOR A, [Y+#ss] 16
CE 3A XOR A, [X+L] 16
CE 3B XOR A, [Y+L] 16
CE 3C XOR [HL], A 16
CE 3D nn XOR [HL], #nn 20
CE 3E XOR [HL], [X] 20
CE 3F XOR [HL], [Y] 20

Execute

#nn     = Immediate unsigned 8-Bits
A       = Register A
B       = Register B
L       = Register L
H       = Register H
F       = Register F
[N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
[HL]    = Memory: (I shl 16) or HL
[X]     = Memory: (XI shl 16) or X
[Y]     = Memory: (YI shl 16) or Y
[#nnnn] = Memory: #nnnn
[X+#ss] = Memory: (XI shl 16) or (X + #ss)
[Y+#ss] = Memory: (YI shl 16) or (Y + #ss)
[X+L]   = Memory: (XI shl 16) or (X + signed(L))
[Y+L]   = Memory: (YI shl 16) or (Y + signed(L))
; XOR Ds, Sc
;
; Ds = Destination
; Sc = Source

Ds = Ds XOR Sc

Description

"8-Bits Destination" Logic XOR (Exclusive-OR) with "8-Bits Source".

Can be used to toggle one or multiple bits.

Bit 0 - Mask $01
Bit 1 - Mask $02
Bit 2 - Mask $04
Bit 3 - Mask $08
Bit 4 - Mask $10
Bit 5 - Mask $20
Bit 6 - Mask $40
Bit 7 - Mask $80
All   - Mask $FF

Conditions

Zero: Set when result is 0

Sign: Set when 7th bit of the result is 1

Carry and Overflow remain unchanged.

Examples

; A = 0x45
XOR A, $40
; A = 0x05
; F = (Zero=0):(Sign=0)
; B = 0xF0
XOR B, $04
; B = 0xF4
; F = (Zero=0):(Sign=1)
; A = 0xF0
XOR A, $55
; A = 0xA5
; F = (Zero=0):(Sign=1)

« Back to Instruction set