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ROL (SPC700): Difference between revisions
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'''ROL''' is an [[SPC700]] instruction that rotates every bit of its operand one bit to the left. The most significant bit is rotated into the [[carry flag]]. The old value of the carry flag is rotated into the least significant bit. | '''ROL''' is an [[SPC700]] instruction that rotates every bit of its operand one bit to the left. The most significant bit is rotated into the [[carry flag]]. The old value of the carry flag is rotated into the least significant bit. A total of 9 bits are rotated. | ||
==== Syntax ==== | ==== Syntax ==== | ||
Latest revision as of 19:33, 4 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 3C | 1 byte | 2 cycles | ||||
| Direct Page | 2B | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | 3B | 2 bytes | 5 cycles | ||||
| Absolute | 2C | 3 bytes | 5 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | C |
ROL is an SPC700 instruction that rotates every bit of its operand one bit to the left. The most significant bit is rotated into the carry flag. The old value of the carry flag is rotated into the least significant bit. A total of 9 bits are rotated.
Syntax
ROL A ROL dp ROL dp+X ROL !abs
See Also
External Links
- Official Super Nintendo development manual on ROL: Appendix C-7 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L549