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ROL (SPC700): Difference between revisions
From SnesLab
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| | |[[Direct Page Addressing | Direct Page]] | ||
|2B | |2B | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Indexed by X]] | ||
|3B | |3B | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|2C | |2C | ||
|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 | ||
|+ | |||
|[[Negative Flag|N]] | |||
|[[Overflow Flag|V]] | |||
|[[Direct Page Flag|P]] | |||
|[[Break Flag|B]] | |||
|[[Half-Carry Flag|H]] | |||
|[[Interrupt Enable Flag|I]] | |||
|[[Zero Flag|Z]] | |||
|[[Carry Flag|C]] | |||
|+ | |+ | ||
|N | |N | ||
|. | |. | ||
|. | |. | ||
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|. | |. | ||
|. | |. | ||
| | |Z | ||
| | |C | ||
|} | |} | ||
'''ROL''' is an [[SPC700]] instruction that rotates 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 ==== | |||
<pre> | |||
ROL A | |||
ROL dp | |||
ROL dp+X | |||
ROL !abs | |||
</pre> | |||
[[File:rol.png]] | |||
=== See Also === | === See Also === | ||
* [[ROR (SPC700)]] | * [[ROR (SPC700)]] | ||
* [[ASL (SPC700)]] | |||
* [[ROL]] | * [[ROL]] | ||
* [[ROL (Super FX)]] | |||
=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on ROL: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | * Official Super Nintendo development manual on ROL: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L549 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Shift Rotation Commands]] | [[Category:Shift Rotation Commands]] | ||
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