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SUBW (SPC700): Difference between revisions
From SnesLab
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!colspan="8"|Flags Affected | !colspan="8"|Flags Affected | ||
|+ | |||
|[[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]] | |||
|+ | |+ | ||
|N | |N | ||
|V | |V | ||
| | |. | ||
| | |. | ||
|H | |H | ||
| | |. | ||
|Z | |Z | ||
|C | |C | ||
|} | |} | ||
'''SUBW''' (Subtract Word) is an [[SPC700]] command that subtracts a 16-bit [[direct page]] word from [[YA]]. | '''SUBW''' (Subtract Word) is an [[SPC700]] command that subtracts a 16-bit [[direct page]] word from [[YA]]. The difference is stored in YA. | ||
==== Syntax ==== | |||
<pre> | |||
SUBW YA, dp | |||
</pre> | |||
=== See Also === | === See Also === | ||
| Line 44: | Line 49: | ||
=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on SUBW: [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | * Official Super Nintendo development manual on SUBW: Table C-12 in [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L587 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:16-bit Operation Commands]] | [[Category:16-bit Operation Commands]] | ||
[[Category:Two-byte Instructions]] | |||
Latest revision as of 14:40, 30 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Direct Page | 9A | 2 bytes | 5 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | V | . | . | H | . | Z | C |
SUBW (Subtract Word) is an SPC700 command that subtracts a 16-bit direct page word from YA. The difference is stored in YA.
Syntax
SUBW YA, dp
See Also
External Links
- Official Super Nintendo development manual on SUBW: Table C-12 in Appendix C-8 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L587