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POP (SPC700): Difference between revisions
From SnesLab
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{| class="wikitable" style="float:right;clear:right;width:40%" | |||
{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Accumulator Addressing | Accumulator]] | ||
| | |AE | ||
|1 byte | |||
|4 cycles | |||
|+ | |||
|[[Stack Addressing | Stack]] | |||
|CE | |||
|1 byte | |||
|4 cycles | |||
|+ | |||
|[[Stack Addressing | Stack]] | |||
|EE | |||
|1 byte | |||
|4 cycles | |||
|+ | |||
|[[Stack Addressing | Stack]] | |||
|8E | |||
|1 byte | |1 byte | ||
|4 cycles | |4 cycles | ||
|} | |} | ||
{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan=" | !colspan="9"|Flags Affected | ||
|+ | |||
|Operand is the PSW? | |||
|[[Negative Flag|N]] | |||
|[[Overflow Flag|V]] | |||
|[[Direct Page Flag|P]] | |||
|[[Break Flag|B]] | |||
|[[Half-Carry Flag|H]] | |||
|[[Interrupt Enable Flag|I]] | |||
|[[Zero Flag|Z]] | |||
|[[Carry Flag|C]] | |||
|+ | |+ | ||
| | |yes | ||
| | | | ||
| | | | ||
| | | | ||
| | | | ||
| | | | ||
| | | | ||
| | | | ||
| | |||
|+ | |+ | ||
|no | |||
|. | |. | ||
|. | |. | ||
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'''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. | |||
=== See Also === | === See Also === | ||
* [[PUSH]] | * [[PUSH]] | ||
=== 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 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Stack Operation Commands]] | [[Category:Stack Operation Commands]] | ||
[[Category:One-byte Instructions]] |
Latest revision as of 12:00, 28 November 2023
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 | ||||||||
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.
See Also
References
- Table C-17 in Appendix C-9 of Book I of the official Super Nintendo development manual