AND = Logical AND
| Hex | Mnemonic | Cycles |
|---|---|---|
| 20 | AND A, A | 8 |
| 21 | AND A, B | 8 |
| 22 nn | AND A, #nn | 8 |
| 23 | AND A, [HL] | 8 |
| 24 nn | AND A, [N+#nn] | 12 |
| 25 nn nn | AND A, [#nnnn] | 16 |
| 26 | AND A, [X] | 8 |
| 27 | AND A, [Y] | 8 |
| 9C nn | AND F, #nn | 12 |
| CE B0 nn | AND B, #nn | 12 |
| CE B1 nn | AND L, #nn | 12 |
| CE B2 nn | AND H, #nn | 12 |
| D8 nn nn | AND [N+#nn], #nn | 20 |
| CE 20 ss | AND A, [X+#ss] | 16 |
| CE 21 ss | AND A, [Y+#ss] | 16 |
| CE 22 | AND A, [X+L] | 16 |
| CE 23 | AND A, [Y+L] | 16 |
| CE 24 | AND [HL], A | 16 |
| CE 25 nn | AND [HL], #nn | 20 |
| CE 26 | AND [HL], [X] | 20 |
| CE 27 | AND [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))
; AND Ds, Sc
;
; Ds = Destination
; Sc = Source
Ds = Ds AND Sc
Description
"8-Bits Destination" Logic AND with "8-Bits Source".
Can be used to reset (clear) one or multiple bits.
Bit 0 - Mask $FE
Bit 1 - Mask $FD
Bit 2 - Mask $FB
Bit 3 - Mask $F7
Bit 4 - Mask $EF
Bit 5 - Mask $DF
Bit 6 - Mask $BF
Bit 7 - Mask $7F
All - Mask $00
Conditions
Zero: Set when result is 0
Sign: Set when bit 7 of the result is 1
Carry and Overflow remain unchanged
Examples
; A = 0x85
AND A, $80
; A = 0x80
; F = (Zero=0):(Sign=1)
; B = 0xF0
AND B, $04
; B = 0x00
; F = (Zero=1):(Sign=0)
; A = 0xF0
AND A, $55
; A = 0x50
; F = (Zero=0):(Sign=0)