INC (SPC700): Difference between revisions

Latest revision as of 14:00, 30 July 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Accumulator	BC	1 byte	2 cycles
Direct Page	AB	2 bytes	4 cycles
Direct Page Indexed by X	BB	2 bytes	5 cycles
Absolute	AC	3 bytes	5 cycles
Implied (type 1)	3D	1 byte	2 cycles
Implied (type 1)	FC	1 byte	2 cycles


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

INC is an SPC700 instruction that increments its operand by one.

Syntax

INC A
INC dp
INC dp+X
INC !abs
INC X
INC Y

The above are official, but some people prefer alternate mnemonics like:

INA
INX
INY

External Links

Official Super Nintendo development manual on INC: Appendix C-7 of Book I
anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L445

@@ Line 1: / Line 1: @@
-'''INC''' is an [[SPC700]] instruction that increments a value.
+{| 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
+|[[Accumulator Addressing | Accumulator]]
 |BC
 |1 byte
 |2 cycles
 |+
-|
+|[[Direct Page Addressing | Direct Page]]
 |AB
-|2 byte
+|2 bytes
 |4 cycles
 |+
-|
+|[[Direct Page Indexed by X]]
 |BB
-|2 byte
+|2 bytes
 |5 cycles
 |+
-|
+|[[Absolute Addressing | Absolute]]
 |AC
 |3 bytes
 |5 cycles
 |+
-|
+|[[Implied]] (type 1)
 |3D
 |1 byte
 |2 cycles
 |+
-|
+|[[Implied]] (type 1)
 |FC
 |1 byte
@@ Line 41: / Line 39: @@
 {| 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 58: / Line 56: @@
 |.
 |.
+|Z
 |.
-|
 |}
+'''INC''' is an [[SPC700]] instruction that increments its operand by one.
+==== Syntax ====
+<pre>
+INC A
+INC dp
+INC dp+X
+INC !abs
+INC X
+INC Y
+</pre>
+The above are official, but some people prefer alternate mnemonics like:
+<pre>
+INA
+INX
+INY
+</pre>
 === See Also ===
 * [[INC]]
+* [[DEC (SPC700)]]
+* [[INX]]
+* [[INY]]
+* [[ADC (SPC700)]]
+* [[ADC]]
 === External Links ===
-* Official Nintendo documentation on INC: https://archive.org/details/SNESDevManual/book1/page/n232
+* Official Super Nintendo development manual on INC: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I]
+* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L445
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Addition and Subtraction Commands]]