CMPW (SPC700): Difference between revisions

Revision as of 20:22, 23 July 2023


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.

External Links

Official Nintendo documentation on CMPW: Appendix C-8 of Book I

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-'''CMPW''' (Compare Word) is an [[SPC700]] command that performs a comparsion between [[YA]] and a 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.
 === See Also ===