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ASL (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 05:03, 27 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 1C | 1 byte | 2 cycles | ||||
| Direct Page | 0B | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | 1B | 2 bytes | 5 cycles | ||||
| Absolute | 0C | 3 bytes | 5 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| 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