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'''SUBW''' is an [[SPC700]] command that stores a difference in [[YA]].
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{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="8"|Basic Info
!colspan="8"|Basic Info
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|'''Speed'''
|'''Speed'''
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|[[Direct Page Addressing | Direct Page]]
|9A
|9A
|2 bytes
|2 bytes
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{| 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
|N
|V
|V
|P
|.
|B
|.
|H
|H
|I
|.
|Z
|Z
|C
|C
|+
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'''SUBW''' (Subtract Word) is an [[SPC700]] command that subtracts a 16-bit [[direct page]] word from [[YA]].  The difference is stored in YA.
==== Syntax ====
<pre>
SUBW YA, dp
</pre>
=== See Also ===
* [[ADDW]]
* [[CMPW]]
* [[MOVW]]
* [[SBC (SPC700)]]


=== External Links ===
=== External Links ===
* Official Nintendo documentation on SUBW: https://archive.org/details/SNESDevManual/book1/page/n233
* Official Super Nintendo development manual on SUBW: 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/master/spc700.txt#L587


[[Category:ASM]]
[[Category:ASM]]
[[Category:SPC700]]
[[Category:SPC700]]
[[Category:16-bit Operation Commands]]
[[Category:16-bit Operation Commands]]
[[Category:Two-byte Instructions]]

Latest revision as of 14:40, 30 July 2024

Basic Info
Addressing Mode Opcode Length Speed
Direct Page 9A 2 bytes 5 cycles
Flags Affected
N V P B H I Z C
N V . . H . Z C

SUBW (Subtract Word) is an SPC700 command that subtracts a 16-bit direct page word from YA. The difference is stored in YA.

Syntax

SUBW YA, dp

See Also

External Links