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 40: / Line 40: @@
 |[[Carry Flag|C]]
 |+
-|
+|N
 |.
 |.
@@ Line 46: / Line 46: @@
 |.
 |.
-|
+|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 ====
@@ Line 64: / Line 64: @@
 === 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]]