PUSH (SPC700)

Basic Info
Addressing Mode	Opcode	Length	Speed
Accumulator	2D	1 byte	4 cycles
Stack - X	4D	1 byte	4 cycles
Stack - Y	6D	1 byte	4 cycles
Stack - PSW	0D	1 byte	4 cycles

Flags Affected
N	V	P	B	H	I	Z	C
.	.	.	.	.	.	.	.

PUSH is an SPC700 command that pushes the value of a register to the stack. The register can be:

• the accumulator
• the X index register
• the Y index register
• the program status word

The stack pointer is decremented by one. No flags are affected.

Syntax

PUSH A
PUSH X
PUSH Y
PUSH PSW

See Also

• POP
• PHA
• PHX
• PHY
• PHP

References

• Table C-17 in Appendix C-9 of Book I of the official Super Nintendo development manual
• anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L541