We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
CMPW (SPC700): Difference between revisions
From SnesLab
(→External Links: added anomie link) |
(made flags affected more prominent) |
||
| Line 25: | Line 25: | ||
|[[Carry Flag|C]] | |[[Carry Flag|C]] | ||
|+ | |+ | ||
| | |N | ||
|. | |. | ||
|. | |. | ||
| Line 31: | Line 31: | ||
|. | |. | ||
|. | |. | ||
| | |Z | ||
| | |C | ||
|} | |} | ||
Latest revision as of 13:55, 30 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 |
| N | . | . | . | . | . | 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 - the side effect is the N, Z, and C flags being modified.
Syntax
CMPW YA, dp
See Also
External Links
- Official Nintendo documentation on CMPW: Table C-12 in Appendix C-8 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L407