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STW (Super FX): Difference between revisions
From SnesLab
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The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | ||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 00:26, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| 3m | 1 byte | 3 to 8 cycles | 7 to 11 cycles | 1 to 6 cycles | |||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
STW (Store Word) is a Super FX instruction that stores the value of the source register to the Game Pak.
The exact number of cycles varies because STW utilizes the RAM buffer.
The operand may be any register from R0 to R11.
The source register should be specified in advance using WITH or FROM. Otherwise, R0 serves as the default.
The ALT0 state is restored.
Syntax
STW (Rm)
Example
Let:
Sreg : R10 R10 = 9326h R2 : 5872h RAMBR = 70h
After STW (R2) is executed:
(70:5872h) = 26h (70:5873h) = 93h
See Also
External Links
- Official Super Nintendo development manual on STW: 9.85 on page 2-9-117 of Book II