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LSR: Difference between revisions
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=== See Also === | |||
* [[ASL]] | |||
=== External Links === | === External Links === | ||
Revision as of 21:10, 17 May 2023
LSR (Logical Shift Right) is a 65x instruction that shifts a value one bit to the right (division by two). The most significant bit becomes a zero. The least significant bit is shifted into the carry flag.
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| accumulator | 4A | 1 byte | 2 cycles | ||||
| absolute | 4E | 3 bytes | 6 cycles | ||||
| direct page | 46 | 2 bytes | 5 cycles | ||||
| absolute indexed X | 5E | 3 bytes | 7 cycles | ||||
| direct page indexed X | 56 | 2 bytes | 6 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| 0 | . | . | . | . | . | |||
See Also
External Links
- Eyes & Lichty page on LSR: https://archive.org/details/0893037893ProgrammingThe65816/page/n491
- Labiak page on LSR: https://archive.org/details/Programming_the_65816/page/n162
- MCS6500 Manual page on LSR: https://archive.org/details/mos_microcomputers_programming_manual/page/n169
- Carr page on LSR: https://archive.org/details/6502UsersManual/page/n278
- Leventhal page on LSR: https://archive.org/details/6502-assembly-language-programming/page/n125
- snes9x implementation of LSR: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L862