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LSR: Difference between revisions

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* [[Carr]] page on LSR: https://archive.org/details/6502UsersManual/page/n278
* [[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
* [[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


[[Category:ASM]]
[[Category:ASM]]

Revision as of 20:44, 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 . . . . .

External Links