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LSR (SPC700): Difference between revisions
From SnesLab
(opcode 5C operates on the accumulator) |
(direct page admode) |
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| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
|[[Accumulator]] | |[[Accumulator Addressing | Accumulator]] | ||
|5C | |5C | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|4B | |4B | ||
|2 bytes | |2 bytes | ||
Revision as of 18:32, 23 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 5C | 1 byte | 2 cycles | ||||
| Direct Page | 4B | 2 bytes | 4 cycles | ||||
| 5B | 2 bytes | 5 cycles | |||||
| 4C | 3 bytes | 5 cycles | |||||
| Flags Clobbered | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | |||
LSR (Logical Shift Right) is an SPC700 instruction that shifts its operand one bit to the right, dividing it by two. The least significant bit is shifted into the carry flag. A zero is shifted into the most significant bit.
The official manual has the bit shift operators for LSR pointing the wrong way.
See Also
External Links
- Official Super Nintendo development manual on LSR: Appendix C-7 of Book I