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POP (SPC700): Difference between revisions

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|4 cycles
|4 cycles
|+
|+
|[[Stack Addressing | Stack]]
|[[Stack Addressing | Stack]] - X
|CE
|CE
|1 byte
|1 byte
|4 cycles
|4 cycles
|+
|+
|[[Stack Addressing | Stack]]
|[[Stack Addressing | Stack]] - Y
|EE
|EE
|1 byte
|1 byte
|4 cycles
|4 cycles
|+
|+
|[[Stack Addressing | Stack]]
|[[Stack Addressing | Stack]] - PSW
|8E
|8E
|1 byte
|1 byte
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|+
|+
|yes
|yes
|
|N
|
|V
|
|P
|
|B
|
|H
|
|I
|
|Z
|
|C
|+
|+
|no
|no
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* the [[Y Index Register]]
* the [[Y Index Register]]
* the [[program status word]]
* the [[program status word]]
The [[stack pointer]] is incremented by one before the value is pulled.


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.
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.
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=== See Also ===
=== See Also ===
* [[PUSH]]
* [[PUSH]]
* [[PLA]]
* [[PLX]]
* [[PLY]]
* [[PLP]]


=== References ===
=== References ===
* Table C-17 in [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I] of the official Super Nintendo development manual
* Table C-17 in [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I] of the official Super Nintendo development manual
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L536


[[Category:ASM]]
[[Category:ASM]]

Latest revision as of 03:52, 9 August 2024

Basic Info
Addressing Mode Opcode Length Speed
Accumulator AE 1 byte 4 cycles
Stack - X CE 1 byte 4 cycles
Stack - Y EE 1 byte 4 cycles
Stack - PSW 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 stack pointer is incremented by one before the value is pulled.

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

References