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CLR1 (SPC700): Difference between revisions
From SnesLab
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!colspan="8"|Flags Affected | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|P | |[[Direct Page Flag|P]] | ||
|B | |[[Break Flag|B]] | ||
|H | |[[Half-Carry Flag|H]] | ||
|I | |[[Interrupt Enable Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
Revision as of 04:51, 27 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Direct Page | 12 | 2 bytes | 4 cycles | ||||
| Direct Page | 32 | 2 bytes | 4 cycles | ||||
| Direct Page | 52 | 2 bytes | 4 cycles | ||||
| Direct Page | 72 | 2 bytes | 4 cycles | ||||
| Direct Page | 92 | 2 bytes | 4 cycles | ||||
| Direct Page | B2 | 2 bytes | 4 cycles | ||||
| Direct Page | D2 | 2 bytes | 4 cycles | ||||
| Direct Page | F2 | 2 bytes | 4 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | . | . |
CLR1 is an SPC700 command that clears a bit in a direct page byte. The byte following the opcode determines which byte. The high nibble of the opcode determines which bit within that byte.
See Also
External Links
- Official Nintendo documentation on CLR1: Table C-18 in Appendix C-9 of Book I