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SBC (SPC700): Difference between revisions
From SnesLab
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Revision as of 06:09, 24 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| immediate | A8 | 2 bytes | 2 cycles | ||||
| Implied (type 1) | 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 | ||||
| Direct Page Indexed by X | A7 | 2 bytes | 6 cycles | ||||
| Direct Page Indirect Indexed by Y | B7 | 2 bytes | 6 cycles | ||||
| B9 | 1 byte | 5 cycles | |||||
| A9 | 3 bytes | 6 cycles | |||||
| Direct Page Immediate | 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