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ROL: Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/n516 | * [[Eyes & Lichty]] page on ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/n516 | ||
* [[Labiak]] page on ROL: https://archive.org/details/Programming_the_65816/page/n184 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
Revision as of 03:16, 16 May 2023
ROL (Rotate Left) is a 65x instruction that rotates a value and the carry flag left one bit. The most significant bit is shifted into the carry flag. The carry flag is shifted into the least significant bit.
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| accumulator | 2A | 1 byte | 2 cycles | ||||
| absolute | 2E | 3 bytes | 6 cycles | ||||
| direct page | 26 | 2 bytes | 5 cycles | ||||
| absolute indexed by X | 3E | 3 bytes | 7 cycles | ||||
| direct page indexed by X | 36 | 2 bytes | 6 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | ||||