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
    

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