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ROR (SPC700): Difference between revisions
From SnesLab
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(→See Also: ror Super FX) |
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{| class="wikitable" style="float:right;clear:right;width:40%" | |||
{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Accumulator Addressing | Accumulator]] | ||
|7C | |7C | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|6B | |6B | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Indexed by X]] | ||
|7B | |7B | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|6C | |6C | ||
|3 bytes | |3 bytes | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|P | |[[Direct Page Flag|P]] | ||
|B | |[[Break Flag|B]] | ||
|H | |[[Half-Carry Flag|H]] | ||
|I | |[[Interrupt Enable Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
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| | | | ||
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|} | |} | ||
'''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. | |||
=== See Also === | |||
* [[ROL (SPC700)]] | |||
* [[ROR]] | |||
* [[ROR (Super FX)]] | |||
=== External Links === | |||
* Official Super Nintendo development manual on ROR: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Shift Rotation Commands]] | [[Category:Shift Rotation Commands]] |
Latest revision as of 19:42, 8 January 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.
See Also
External Links
- Official Super Nintendo development manual on ROR: Appendix C-7 of Book I