Pokémon mini Development Documentation

PUSH = Push Register into Stack

Hex	Mnemonic	Cycles	Regs stacked from top to bottom
A0	PUSH BA	4	B, A
A1	PUSH HL	4	H, L
A2	PUSH IX	4	IX(Hi), IX(Lo)
A3	PUSH IY	4	IY(Hi), IY(Lo)
A4	PUSH BR	3	BR
A5	PUSH EP	3	EP
A6	PUSH IP	4	XP, YP
A7	PUSH SC	3	SC
CF B0	PUSH A	3	A
CF B1	PUSH B	3	B
CF B2	PUSH L	3	L
CF B3	PUSH H	3	H
CF B8	PUSH ALL	48	B, A, H, L, IX(Hi:Lo), IY(Hi:Lo), BR
CF B9	PUSH ALE	60	B, A, H, L, IX(Hi:Lo), IY(Hi:Lo), BR, EP, XP, YP

Execute

A  = Register A
B  = Register B
L  = Register L
H  = Register H
BR = Register BR
SC = Register SC
EP = Register EP
XP = Register XP
YP = Register YP
BA = Register BA: (B shl 8) or A
HL = Register HL: (H shl 8) or L
IX = Register IX
IY = Register IY
SP = Register SP (Stack Pointer)

PUSH 16-bits

; PUSH r16
;
; r16 = 16-bits Register (BA, HL, IX or IY)

SP = SP - 2
Memory[SP+1] = r16 SRL 8      ; (High Byte)
Memory[SP]   = r16 AND 0x00FF ; (Low Byte)

PUSH 8-bits

; PUSH r8
;
; r8  =  8-bits Register (A, B, L, H, BR, EP and SC)

SP = SP - 1
Memory[SP]   = r8

PUSH IP

; PUSH IP

SP = SP - 2
Memory[SP+1] = XP
Memory[SP]   = YP

PUSH ALL

; PUSH ALL

SP = SP - 9
Memory[SP+8] = B
Memory[SP+7] = A
Memory[SP+6] = H
Memory[SP+5] = L
Memory[SP+4] = IX SRL 8      ; IX(Hi)
Memory[SP+3] = IX AND 0x00FF ; IX(Lo)
Memory[SP+2] = IY SRL 8      ; IY(Hi)
Memory[SP+1] = IY AND 0x00FF ; IY(Lo)
Memory[SP]   = BR

PUSH ALE

; PUSH ALE

SP = SP - 12
Memory[SP+11] = B
Memory[SP+10] = A
Memory[SP+9]  = H
Memory[SP+8]  = L
Memory[SP+7]  = IX SRL 8      ; IX(Hi)
Memory[SP+6]  = IX AND 0x00FF ; IX(Lo)
Memory[SP+5]  = IY SRL 8      ; IY(Hi)
Memory[SP+4]  = IY AND 0x00FF ; IY(Lo)
Memory[SP+3]  = BR
Memory[SP+2]  = EP
Memory[SP+1]  = XP
Memory[SP]    = YP

Description

Push register(s) into the stack.

Conditions

None

Examples

; BA = 0x1337
; SP = 0x2000
PUSH BA
; BA = 0x1337
; SP = 0x1FFE
[`LD A, 0x80`](PM_Opc_MOV8.md)
; BA = 0x1380
; SP = 0x1FFE
[`INC B`](PM_Opc_INC.md)
; BA = 0x1480
; SP = 0x1FFE
[`POP BA`](PM_Opc_POP.md)
; BA = 0x1337
; SP = 0x2000

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