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DEC (SPC700): Difference between revisions
From SnesLab
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(pluralize bytes) |
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|[[Direct Page Addressing | Direct Page]] | |[[Direct Page Addressing | Direct Page]] | ||
|8B | |8B | ||
|2 | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
|[[Direct Page Indexed by X]] | |[[Direct Page Indexed by X]] | ||
|9B | |9B | ||
|2 | |2 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
Revision as of 21:00, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 9C | 1 byte | 2 cycles | ||||
| Direct Page | 8B | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | 9B | 2 bytes | 5 cycles | ||||
| Absolute | 8C | 3 bytes | 5 cycles | ||||
| Implied (type 1) | 1D | 1 byte | 2 cycles | ||||
| Implied (type 1) | DC | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | ||
DEC is an SPC700 instruction that decrements its operand by one.
Syntax
DEC A DEC dp DEC dp+X DEC !abs DEC X DEC Y
See Also
External Links
- Official Super Nintendo development manual on DEC: Appendix C-7 of Book I