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POP (SPC700): Difference between revisions
From SnesLab
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|+ | |+ | ||
|Operand is the PSW? | |Operand is the PSW? | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|P | |[[Direct Page Flag|P]] | ||
|B | |[[Break Flag|B]] | ||
|H | |[[Half-Carry Flag|H]] | ||
|I | |[[Interrupt Enable Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|yes | |yes | ||
Revision as of 04:49, 27 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