ADDW (SPC700): Difference between revisions

Latest revision as of 13:50, 30 July 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Direct Page	7A	2 bytes	5 cycles


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

ADDW (Add Word) is an SPC700 command that adds a 16-bit direct page value to YA. The sum is stored in YA.

ADDW YA, dp

@@ Line 1: / Line 1: @@
-'''ADDW''' is an [[SPC700]] command that stores a sum in [[YA]].
+{| 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'''
 |+
-|
+|[[Direct Page Addressing | Direct Page]]
 |7A
 |2 bytes
@@ Line 16: / Line 14: @@
 {| 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
-|+
-|
-|
-|.
-|.
-|
-|.
-|
-|
 |}
-[[Category:ASM]]
+'''ADDW''' (Add Word) is an [[SPC700]] command that adds a 16-bit [[direct page]] value to [[YA]].  The sum is stored in YA.
-[[Category:SPC700]]
-[[Category:16-bit Operation Commands]]
+==== Syntax ====
+<pre>
+ADDW YA, dp
+</pre>
+=== See Also ===
+* [[SUBW]]
+* [[CMPW]]
+* [[MOVW]]
+* [[ADC (SPC700)]]
+=== External Links ===
+* Official Super Nintendo development manual on ADDW: Table C-12 in [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I]
+* anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L317
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:16-bit Operation Commands]]
+[[Category:Two-byte Instructions]]