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ROR (SPC700): Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on ROR: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | * Official Super Nintendo development manual on ROR: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L554 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Shift Rotation Commands]] | [[Category:Shift Rotation Commands]] | ||
Revision as of 21:45, 13 July 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 |
| . | . | . | . | . | |||
ROR is an SPC700 instruction that rotates 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.
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