POP = Pop Register from Stack
| Hex | Mnemonic | Cycles | Regs stacked from top to bottom |
|---|---|---|---|
| A8 | POP BA | 12 | B, A |
| A9 | POP HL | 12 | H, L |
| AA | POP X | 12 | X(Hi), X(Lo) |
| AB | POP Y | 12 | Y(Hi), Y(Lo) |
| AC | POP N | 8 | N |
| AD | POP I | 8 | I |
| AE | POPX | 12 | XI, YI |
| AF | POP F | 8 | F |
| CF B4 | POP A | 12 | A |
| CF B5 | POP B | 12 | B |
| CF B6 | POP L | 12 | L |
| CF B7 | POP H | 12 | H |
| CF BC | POPA | 44 | B, A, H, L, X(Hi:Lo), Y(Hi:Lo), N |
| CF BD | POPAX | 56 | B, A, H, L, X(Hi:Lo), Y(Hi:Lo), N, I, XI, YI |
Execute
A = Register A
B = Register B
L = Register L
H = Register H
N = Register N
F = Register F
I = Register I
XI = Register XI
YI = Register YI
BA = Register BA: (B shl 8) or A
HL = Register HL: (H shl 8) or L
X = Register X
Y = Register Y
SP = Register SP (Stack Pointer)
; POP r16
;
; r16 = 16-Bits Register (BA, HL, X or Y)
r16 = (Memory[SP+1] SHL 8) OR Memory[SP]
SP = SP + 2
; POP r8
;
; r8 = 8-Bits Register (A, B, L, H, N, I and F)
r8 = Memory[SP]
SP = SP + 1
; POPX
XI = Memory[SP+1]
YI = Memory[SP]
SP = SP + 2
; POPA
B = Memory[SP+8] = B
A = Memory[SP+7] = A
H = Memory[SP+6] = H
L = Memory[SP+5] = L
X = (Memory[SP+4] SHL 8) OR Memory[SP+3]
Y = (Memory[SP+2] SHL 8) OR Memory[SP+1]
N = Memory[SP]
SP = SP + 9
; POPAX
B = Memory[SP+11]
A = Memory[SP+10]
H = Memory[SP+9]
L = Memory[SP+8]
X = (Memory[SP+7] SHL 8) OR Memory[SP+6]
Y = (Memory[SP+5] SHL 8) OR Memory[SP+4]
N = Memory[SP+3]
I = Memory[SP+2]
XI = Memory[SP+1]
YI = Memory[SP]
SP = SP + 12
Description
Pop register(s) from the stack.
Conditions
None
Examples
; BA = 0x1337 ; SP = 0x2000 PUSH BA ; BA = 0x1337 ; SP = 0x1FFE MOV A, 0x80 ; BA = 0x1380 ; SP = 0x1FFE INC B ; BA = 0x1480 ; SP = 0x1FFE POP BA ; BA = 0x1337 ; SP = 0x2000