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ASL (SPC700): Difference between revisions
From SnesLab
(opcode 1C operates on the accumulator) |
(direct page admode) |
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
|[[Accumulator]] | |[[Accumulator Addressing | Accumulator]] | ||
|1C | |1C | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|0B | |0B | ||
|2 bytes | |2 bytes | ||
Revision as of 18:31, 23 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 1C | 1 byte | 2 cycles | ||||
| Direct Page | 0B | 2 bytes | 4 cycles | ||||
| 1B | 2 bytes | 5 cycles | |||||
| 0C | 3 bytes | 5 cycles | |||||
| Flags Clobbered | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | |||
ASL (Arithmetic Shift Left) is an SPC700 instruction that shifts its operand one bit to the left, more or less multiplying it by two. A zero is shifted into the least significant bit. The most significant bit is shifted into the carry flag.
See Also
External Links
- Official Super Nintendo development manual on ASL: Appendix C-7 of Book I