SM (Super FX): Difference between revisions

Latest revision as of 05:46, 16 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Implied Indirect	3EFnxxxx	4 bytes	12 to 17 cycles	16 to 20 cycles	4 to 9 cycles


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
0	0	0	.	.	.	.

SM (Store to raM) is a Super FX instruction that stores a value to the Game Pak. The bank must be specified with RAMB.

The number of cycles varies because of the RAM buffer.

The ALT0 state is restored.

SM (xx), Rn

Let:

R₄ = 438ch
RAMBR = 70h

After executing SM (0b492h), R₄:

(70:b492h) = 8ch
(70:b493h) = 43h

@@ Line 2: / Line 2: @@
 !colspan="8"|Basic Info
 |+
+|'''Addressing Mode'''
 |'''Opcode'''
 |'''Length'''
@@ Line 8: / Line 9: @@
 |'''Cache Speed'''
 |+
+|[[Implied Indirect]]
 |3EFnxxxx
 |4 bytes
@@ Line 24: / Line 26: @@
 |[[Sign Flag|S]]
 |[[CY]]
-|Z
+|[[Zero Flag|Z]]
 |+
 |0
@@ Line 35: / Line 37: @@
 |}
-'''SM''' is a [[Super FX]] instruction that stores a value to the [[Game Pak]].
+'''SM''' (Store to raM) is a [[Super FX]] instruction that stores a value to the [[Game Pak]].  The bank must be specified with [[RAMB]].
+The number of cycles varies because of the [[RAM buffer]].
+The [[ALT0]] state is restored.
+==== Syntax ====
+<pre>
+SM (xx), Rn
+</pre>
+==== Example ====
+Let:
+ R<sub>4</sub> = 438ch
+ RAMBR = 70h
+After executing SM (0b492h), R<sub>4</sub>:
+ (70:b492h) = 8ch
+ (70:b493h) = 43h
 === See Also ===
 * [[SMS]]
-* [[RAMB]]
+* [[LM (Super FX)|LM]]
+* [[LMS]]
+* [[ALT2]]
 === External Links ===
-* Official Nintendo documentation on SM: [https://archive.org/details/SNESDevManual/book2/page/n268 Page 2-9-112 of Book II]
+* Official Nintendo documentation on SM: 9.81 on [https://archive.org/details/SNESDevManual/book2/page/n268 page 2-9-112 of Book II]
 [[Category:ASM]]
 [[Category:Super FX]]
 [[Category:Data Transfer Instructions]]