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ASL (SPC700): Difference between revisions
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'''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]]. | '''ASL''' (Arithmetic Shift Left) is an [[SPC700]] instruction that shifts all 8 bits of 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]]. | ||
==== Syntax ==== | ==== Syntax ==== | ||
Latest revision as of 00:05, 15 August 2024
| 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 |
| N | . | . | . | . | . | Z | C |
ASL (Arithmetic Shift Left) is an SPC700 instruction that shifts all 8 bits of 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.
Syntax
ASL A ASL dp ASL dp+x ASL !abs
See Also
External Links
- Official Super Nintendo development manual on ASL: Appendix C-7 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L335