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CMPW (SPC700): Difference between revisions
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'''CMPW''' (Compare Word) is an [[SPC700]] command that performs a comparsion between [[YA]] and a 16-bit word in the [[direct page]]. Internally, this is done by the [[ALU]] subtracting the direct page word from YA, but the difference is not stored anywhere. | '''CMPW''' (Compare Word) is an [[SPC700]] command that performs a comparsion between [[YA]] and a 16-bit word in the [[direct page]]. Internally, this is done by the [[ALU]] subtracting the direct page word from YA, but the difference is not stored anywhere. | ||
==== Syntax ==== | |||
<pre> | |||
CMPW YA, dp | |||
</pre> | |||
=== See Also === | === See Also === | ||
Revision as of 19:36, 6 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Direct Page | 5A | 2 bytes | 4 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | |||
CMPW (Compare Word) is an SPC700 command that performs a comparsion between YA and a 16-bit word in the direct page. Internally, this is done by the ALU subtracting the direct page word from YA, but the difference is not stored anywhere.
Syntax
CMPW YA, dp
See Also
External Links
- Official Nintendo documentation on CMPW: Table C-12 in Appendix C-8 of Book I