POP (SPC700)

Basic Info
Addressing Mode	Opcode	Length	Speed
Accumulator	AE	1 byte	4 cycles
Stack	CE	1 byte	4 cycles
Stack	EE	1 byte	4 cycles
Stack	8E	1 byte	4 cycles

Flags Affected
Operand is the PSW?	N	V	P	B	H	I	Z	C
yes	N	V	P	B	H	I	Z	C
no	.	.	.	.	.	.	.	.

POP is an SPC700 command that pops a byte from the stack, pulling it into a register. The target register can be:

• the accumulator
• the X Index Register
• the Y Index Register
• the program status word

When the program status word is the operand, all the flags are naturally affected as that is the register they live in. Otherwise, no flags are affected.

Syntax

POP A
POP X
POP Y
POP PSW

See Also

• PUSH

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#L536