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DEC (Super FX): Difference between revisions

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{| class="wikitable" style="float:right;clear:right;width:40%"
{| class="wikitable" style="float:right;clear:right;width:50%"
!colspan="8"|Basic Info
!colspan="8"|Basic Info
|+
|+
|'''Addressing Mode'''
|'''Opcode'''
|'''Opcode'''
|'''Length'''
|'''Length'''
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|'''Cache Speed'''
|'''Cache Speed'''
|+
|+
|[[Implied]] (type 1)
|En
|En
|1 byte
|1 byte
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!colspan="9"|Flags Affected
!colspan="9"|Flags Affected
|+
|+
|B
|[[B Flag|B]]
|[[ALT1]]
|[[ALT1]]
|[[ALT2]]
|[[ALT2]]
|[[O/V]]
|[[O/V]]
|S
|[[Sign Flag|S]]
|[[CY]]
|[[CY]]
|Z
|[[Zero Flag|Z]]
|+
|+
|0
|0
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|0
|0
|.
|.
|
|S
|.
|.
|
|Z
|}
|}


'''DEC''' is a [[Super FX]] instruction that decrements a register.
'''DEC''' is a [[Super FX]] instruction that decrements a register by one. The register selected can be from R<sub>0</sub> to R<sub>14</sub>.
 
The [[ALT0]] state is restored.
 
==== Syntax ====
<pre>
DEC Rn
</pre>
 
==== Example ====
Let:
R<sub>9</sub> = a3f7h
After executing DEC R<sub>9</sub>:
R<sub>9</sub> = a3f6h


=== See Also ===
=== See Also ===
* [[INC (Super FX)]]
* [[INC (Super FX)]]
* [[DEC]]
* [[DEC]]
* [[DEC (SPC700)]]
* [[DEX]]
* [[DEY]]


=== External Links ===
=== External Links ===
* Official Nintendo documentation on DEC: [https://archive.org/details/SNESDevManual/book2/page/n199 Page 2-9-43 of Book II]
* Official Nintendo documentation on DEC: 9.31 on [https://archive.org/details/SNESDevManual/book2/page/n199 page 2-9-43 of Book II]


[[Category:ASM]]
[[Category:ASM]]

Latest revision as of 18:43, 30 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) En 1 byte 3 cycles 3 cycles 1 cycle
Flags Affected
B ALT1 ALT2 O/V S CY Z
0 0 0 . S . Z

DEC is a Super FX instruction that decrements a register by one. The register selected can be from R0 to R14.

The ALT0 state is restored.

Syntax

DEC Rn

Example

Let:

R9 = a3f7h

After executing DEC R9:

R9 = a3f6h

See Also

External Links