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MOVW (SPC700): Difference between revisions
From SnesLab
(MOVW is exclusive to YA) |
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=== External Links === | === External Links === | ||
* Official Nintendo | * Official Super Nintendo development manual on MOVW: [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:16-bit Data Transmission Commands]] | [[Category:16-bit Data Transmission Commands]] | ||
Revision as of 02:12, 8 July 2023
MOVW (Move Word) is an SPC700 instruction that moves a 16-bit ARAM value to or from the YA register. There are no variations of MOVW that do not operate on YA.
Example
From the IPL ROM,
MOVW YA, $F6 ; load the byte at ARAM location $F6 into A and the byte at $F7 into Y MOVW $00, YA ; store the value in Y to ARAM location $01 and the value in A to $00
| Basic Info (to YA) | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| BA | 2 bytes | 5 cycles | |||||
| Flags Clobbered (to YA) | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | |||
| Basic Info (from YA) | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| DA | 2 bytes | 4 cycles | |||||
| Flags Clobbered (from YA) | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | . | . |
See Also
External Links
- Official Super Nintendo development manual on MOVW: Appendix C-8 of Book I