xor

Logical exclusive OR

Sets A to the bitwise exclusive OR of A and a register, memory byte or immediate value.

Used in

8-bit and 16-bit arithmetic, logic and bitsZ80 assembly
The screen, keyboard and mouse through portsZ80 assembly
Sum of an arrayZ80 assembly
Multiply and divide, with the remainderZ80 assembly
A jump tableZ80 assembly
Print a number in any base without helpZ80 assembly
Drawing shapes on the screenZ80 assembly
A bouncing ballZ80 assembly
Move a square with the keyboardZ80 assembly
The snake gameZ80 assembly

SZHP/VNC ●●0●00

● set from the result
0 always 0

Forms

xor 1 byte · 4 cycles

Bitwise XOR on A with r.
xor 1 byte · 7 cycles

Bitwise XOR on A with (HL).
xor 2 bytes · 7 cycles

Bitwise XOR on A with nn.
xor 3 bytes · 19 cycles

Bitwise XOR on A with the value pointed to by IX plus dd.

Pseudo-instructions

Other spellings the assembler accepts; each form shows the instruction it becomes.

xor a, 1 byte · 4 cycles

Bitwise XOR on A with r.
xor a, 1 byte · 7 cycles

Bitwise XOR on A with (HL).
xor a, 2 bytes · 7 cycles

Bitwise XOR on A with nn.
xor a, 3 bytes · 19 cycles

Bitwise XOR on A with the value pointed to by IX plus dd.

Undocumented 1 row

Left out of Zilog's manual, but the Z80 runs them, and so does this emulator.

xor 2 bytes · 8 cycles

Bitwise XOR on A with ixh/l.

Pseudo-instructions · Undocumented 1 row

Other spellings the assembler accepts; each form shows the instruction it becomes. Left out of Zilog's manual, but the Z80 runs them, and so does this emulator.

xor a, 2 bytes · 8 cycles

Bitwise XOR on A with ixh/l.

Operands

r: An 8-bit register: a, b, c, d, e, h or l.
(hl): The byte in memory at the address stored in hl. More
nn: An 8-bit immediate value, 0 to 255 or -128 to 127, written as a number, character constant or symbol. More
(ix+dd): The byte in memory at ix + dd, where dd is a signed displacement from -128 to 127, for example (ix+5) or (ix-3). (iy+dd) works the same way. More
ixh/l: The high or low byte of ix: ixh or ixl. For iy, use iyh or iyl. More

        .org 0x8000
        ld a, 5
        ld b, 3
        xor b
        halt1
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