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ROL: Difference between revisions
From SnesLab
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'''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. | '''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. | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | |||
!colspan="8"|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 | |||
|} | |||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
Revision as of 05:50, 2 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 | |
| . | . | . | . | . | ||||