ROL (SPC700): Difference between revisions

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

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

@@ Line 1: / Line 1: @@
-{| class="wikitable" style="float:right;clear:right;width:30%"
+{| class="wikitable" style="float:right;clear:right;width:40%"
 !colspan="8"|Basic Info
 |+
@@ Line 7: / Line 7: @@
 |'''Speed'''
 |+
-|
+|[[Accumulator Addressing | Accumulator]]
 |3C
 |1 byte
 |2 cycles
 |+
-|
+|[[Direct Page Addressing | Direct Page]]
 |2B
 |2 bytes
 |4 cycles
 |+
-|
+|[[Direct Page Indexed by X]]
 |3B
 |2 bytes
 |5 cycles
 |+
-|
+|[[Absolute Addressing | Absolute]]
 |2C
 |3 bytes
@@ Line 29: / Line 29: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="8"|Flags Clobbered
+!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
-|V
-|P
-|B
-|H
-|I
-|Z
-|C
-|+
-|
 |.
 |.
@@ Line 46: / Line 46: @@
 |.
 |.
-|
+|Z
-|
+|C
 |}
-'''ROL''' is an [[SPC700]] instruction that rotates to the left.
+'''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 ===
 * [[ROR (SPC700)]]
+* [[ASL (SPC700)]]
 * [[ROL]]
+* [[ROL (Super FX)]]
 === External Links ===
 * 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:SPC700]]
 [[Category:Shift Rotation Commands]]