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ROR (SPC700): Difference between revisions
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'''ROR''' is an [[SPC700]] instruction that rotates every bit of its operand one bit to the right. The old value of the [[carry flag]] is rotated into the most significant bit. The least significant bit is rotated into the carry flag. | '''ROR''' is an [[SPC700]] instruction that rotates every bit of its operand one bit to the right. The old value of the [[carry flag]] is rotated into the most significant bit. The least significant bit is rotated into the carry flag. A total of 9 bits are rotated. | ||
The official manual has the bit shift operators for ROR pointing the wrong way. | The official manual has the bit shift operators for ROR pointing the wrong way. | ||
Latest revision as of 19:34, 4 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 7C | 1 byte | 2 cycles | ||||
| Direct Page | 6B | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | 7B | 2 bytes | 5 cycles | ||||
| Absolute | 6C | 3 bytes | 5 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | C |
ROR is an SPC700 instruction that rotates every bit of its operand one bit to the right. The old value of the carry flag is rotated into the most significant bit. The least significant bit is rotated into the carry flag. A total of 9 bits are rotated.
The official manual has the bit shift operators for ROR pointing the wrong way.
Syntax
ROR A ROR dp ROR dp+X ROR !abs
See Also
External Links
- Official Super Nintendo development manual on ROR: Appendix C-7 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L554