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DECW (SPC700): Difference between revisions
From SnesLab
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Direct Page Addressing | Direct Page]] | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !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 | ||
|. | |. | ||
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| | |Z | ||
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'''DECW''' is an [[SPC700]] command that decrements a 16-bit word of the [[direct page]]. | '''DECW''' is an [[SPC700]] command that decrements a 16-bit word of the [[direct page]]. | ||
==== Syntax ==== | |||
<pre> | |||
DECW dp | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[INCW]] | * [[INCW]] | ||
* [[MOVW]] | |||
* [[DEC (SPC700)]] | |||
* [[DEC]] | |||
* [[Memory Pair]] | |||
=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on DECW: [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | * Official Super Nintendo development manual on DECW: 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#L422 | |||
[[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 12:23, 30 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Direct Page | 1A | 2 bytes | 6 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | . |
DECW is an SPC700 command that decrements a 16-bit word of the direct page.
Syntax
DECW dp
See Also
External Links
- Official Super Nintendo development manual on DECW: Table C-12 in Appendix C-8 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L422