We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

ROR (SPC700): Difference between revisions

From SnesLab
Jump to: navigation, search
(added syntax)
(9 bits rotated)
 
(5 intermediate revisions by the same user not shown)
Line 40: Line 40:
|[[Carry Flag|C]]
|[[Carry Flag|C]]
|+
|+
|
|N
|.
|.
|.
|.
Line 46: Line 46:
|.
|.
|.
|.
|
|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.
'''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.
Line 61: Line 61:
ROR !abs
ROR !abs
</pre>
</pre>
[[File:ror.png]]


=== See Also ===
=== See Also ===
* [[ROL (SPC700)]]
* [[ROL (SPC700)]]
* [[LSR (SPC700)]]
* [[ROR]]
* [[ROR]]
* [[ROR (Super FX)]]
* [[ROR (Super FX)]]
Line 69: Line 72:
=== 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]]

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

ror.png

See Also

External Links