MUL (SPC700): Difference between revisions

Latest revision as of 12:22, 22 December 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Implied (type 1)	CF	1 byte	9 cycles


Flags Affected
N	V	P	B	H	I	Z	C
	.	.	.	.	.		.

MUL is an SPC700 instruction that multiplies the value in the Y index register by the value in the accumulator and stores the product in YA. The high byte of the product is stored in Y and the low byte is stored in A.^[2]

External Links

Official Super Nintendo development manual on MUL: Table C-13, Appendix C-8 of Book I
https://forums.nesdev.org/viewtopic.php?p=141221#p141221

@@ Line 1: / Line 1: @@
-'''MUL''' is an [[SPC700]] multiplication instruction.
+{| class="wikitable" style="float:right;clear:right;width:40%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 9: / Line 7: @@
 |'''Speed'''
 |+
-|implied
+|[[Implied]] (type 1)
 |CF
 |1 byte
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 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="8"|Flags Clobbered
+!colspan="8"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|P
+|[[Direct Page Flag|P]]
-|B
+|[[Break Flag|B]]
-|H
+|[[Half-Carry Flag|H]]
-|I
+|[[Interrupt Enable Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |
@@ Line 36: / Line 34: @@
 |.
 |}
+'''MUL''' is an [[SPC700]] instruction that multiplies the value in the [[Y index register]] by the value in the [[accumulator]] and stores the product in [[YA]].  The high byte of the product is stored in Y and the low byte is stored in A.<sup>[2]</sup>
 === See Also ===
 * [[DIV]]
+* [[ADC (SPC700)]]
+* [[SBC (SPC700)]]
+* [[MULT]]
+=== External Links ===
+# Official Super Nintendo development manual on MUL: Table C-13, [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I]
+# https://forums.nesdev.org/viewtopic.php?p=141221#p141221
 [[Category:ASM]]
 [[Category:SPC700]]
+[[Category:Multiplication and Division Commands]]
+[[Category:One-byte Instructions]]