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SBC (SPC700): Difference between revisions
From SnesLab
(direct page admode) |
(abs admode) |
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|3 cycles | |3 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Indexed by X]] | ||
|B4 | |B4 | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|A5 | |A5 | ||
|3 bytes | |3 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Absolute Indexed by X]] | ||
|B5 | |B5 | ||
|3 bytes | |3 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Absolute Indexed by Y]] | ||
|B6 | |B6 | ||
|3 bytes | |3 bytes | ||
Revision as of 18:58, 23 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| immediate | A8 | 2 bytes | 2 cycles | ||||
| A6 | 1 byte | 3 cycles | |||||
| Direct Page | A4 | 2 bytes | 3 cycles | ||||
| Direct Page Indexed by X | B4 | 2 bytes | 4 cycles | ||||
| Absolute | A5 | 3 bytes | 4 cycles | ||||
| Absolute Indexed by X | B5 | 3 bytes | 5 cycles | ||||
| Absolute Indexed by Y | B6 | 3 bytes | 5 cycles | ||||
| A7 | 2 bytes | 6 cycles | |||||
| B7 | 2 bytes | 6 cycles | |||||
| B9 | 1 byte | 5 cycles | |||||
| A9 | 3 bytes | 6 cycles | |||||
| B8 | 3 bytes | 5 cycles | |||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | |||||
SBC (Subtract) is an SPC700 instruction that subtracts the right operand and the inverse of the carry flag from the left operand. Often, the left operand is the accumulator.
See Also
External Links
- Official Super Nintendo development manual on SBC: Appendix C-5 of Book I