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POP (SPC700): Difference between revisions
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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 | ||
|+ | |+ | ||
|N | |Operand is the PSW? | ||
|V | |[[Negative Flag|N]] | ||
|P | |[[Overflow Flag|V]] | ||
|B | |[[Direct Page Flag|P]] | ||
|H | |[[Break Flag|B]] | ||
|I | |[[Half-Carry Flag|H]] | ||
|Z | |[[Interrupt Enable Flag|I]] | ||
|C | |[[Zero Flag|Z]] | ||
|[[Carry Flag|C]] | |||
|+ | |+ | ||
|yes | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
|+ | |||
|no | |||
|. | |. | ||
|. | |. | ||
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|} | |} | ||
'''POP''' is an [[SPC700]] command that pops | '''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 [[ | 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 === | ||
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=== References === | === References === | ||
* [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 | ||
[[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