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DEC (Super FX): Difference between revisions
From SnesLab
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|[[Sign Flag|S]] | |[[Sign Flag|S]] | ||
|[[CY]] | |[[CY]] | ||
|Z | |[[Zero Flag|Z]] | ||
|+ | |+ | ||
|0 | |0 | ||
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|0 | |0 | ||
|. | |. | ||
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'''DEC''' is a [[Super FX]] instruction that decrements a register. The register selected can be from R<sub>0</sub> to R<sub>14</sub>. | '''DEC''' is a [[Super FX]] instruction that decrements a register by one. The register selected can be from R<sub>0</sub> to R<sub>14</sub>. | ||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | ==== Syntax ==== | ||
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DEC Rn | DEC Rn | ||
</pre> | </pre> | ||
==== Example ==== | |||
Let: | |||
R<sub>9</sub> = a3f7h | |||
After executing DEC R<sub>9</sub>: | |||
R<sub>9</sub> = a3f6h | |||
=== See Also === | === See Also === | ||
* [[INC (Super FX)]] | * [[INC (Super FX)]] | ||
* [[DEC]] | * [[DEC]] | ||
* [[DEC (SPC700)]] | |||
* [[DEX]] | |||
* [[DEY]] | |||
=== External Links === | === External Links === | ||
Latest revision as of 18:43, 30 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | En | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | S | . | Z | ||
DEC is a Super FX instruction that decrements a register by one. The register selected can be from R0 to R14.
The ALT0 state is restored.
Syntax
DEC Rn
Example
Let:
R9 = a3f7h
After executing DEC R9:
R9 = a3f6h
See Also
External Links
- Official Nintendo documentation on DEC: 9.31 on page 2-9-43 of Book II