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Program Status Word: Difference between revisions
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=== See Also === | === See Also === | ||
* [[Processor Status Register]] | * [[Processor Status Register]] | ||
=== Reference === | |||
* https://archive.org/details/SNESDevManual/book1/page/n184 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
Revision as of 15:42, 14 December 2023
The Program Status Word is an 8-bit register on the SPC700 that stores the values of status flags. They are typically listed in this order: NVPBHIZC. More verbosely:
| Flag Name | Bit Position |
|---|---|
| Negative Flag | bit 7 |
| Overflow Flag | bit 6 |
| Direct Page Flag | bit 5 |
| Break Flag | bit 4 |
| Half-carry flag | bit 3 |
| Interrupt Enable Flag | bit 2 |
| Zero Flag | bit 1 |
| Carry Flag | bit 0 |
Both the PUSH and POP commands can operate on the PSW.