We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
Program Status Word: Difference between revisions
From SnesLab
(linkify) |
(→Reference: more correct subparagraph terminology) |
||
| (3 intermediate revisions by the same user not shown) | |||
| Line 27: | Line 27: | ||
=== See Also === | === See Also === | ||
* [[Processor Status Register]] | * [[Processor Status Register]] | ||
=== Reference === | |||
* subparagraph 8.1.6, [https://archive.org/details/SNESDevManual/book1/page/n184 page 3-8-6 of Book I] of the official Super Nintendo development manual | |||
[[Category:ASM]] | [[Category:ASM]] | ||
Latest revision as of 14:13, 29 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.
See Also
Reference
- subparagraph 8.1.6, page 3-8-6 of Book I of the official Super Nintendo development manual