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FROM (Super FX): Difference between revisions
From SnesLab
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'''FROM''' is a [[Super FX]] register prefix instruction that specifies the [[source register]]. The exception is when the [[B Flag]] is set (i.e. a [[WITH]] instruction is executed immediately before) in which case a [[MOVES]] is executed instead with | '''FROM''' is a [[Super FX]] register prefix instruction that specifies the [[source register]]. The exception is when the [[B Flag]] is set (i.e. a [[WITH]] instruction is executed immediately before) in which case a [[MOVES]] is executed instead with FROM acting as the source and WTIH as the destination.<sup>[1]</sup> | ||
No flags are affected. | No flags are affected. | ||
| Line 54: | Line 54: | ||
* [[WITH (Super FX)]] | * [[WITH (Super FX)]] | ||
* [[MOVES (Super FX)]] | * [[MOVES (Super FX)]] | ||
=== Notes === | |||
<sup>[1]</sup> The information in the developer manual is actually contradictory. The description of FROM claims the transfer happens from R<sub>n</sub> (set by FROM) to D<sub>reg</sub> (set by WITH) whereas that of MOVES R<sub>n</sub>, R<sub>n</sub>' claims to transfer from R<sub>n</sub>' (set by WITH) to R<sub>n</sub> (set by FROM) instead. According to [[fullsnes]], it's the description of MOVES which is wrong. | |||
=== External Links === | === External Links === | ||
Latest revision as of 12:48, 15 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | Bn | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| . | . | . | . | . | . | . | ||
FROM is a Super FX register prefix instruction that specifies the source register. The exception is when the B Flag is set (i.e. a WITH instruction is executed immediately before) in which case a MOVES is executed instead with FROM acting as the source and WTIH as the destination.[1]
No flags are affected.
Syntax
FROM Rn
Example
To set R2 as the source register, run:
FROM R2
See Also
Notes
[1] The information in the developer manual is actually contradictory. The description of FROM claims the transfer happens from Rn (set by FROM) to Dreg (set by WITH) whereas that of MOVES Rn, Rn' claims to transfer from Rn' (set by WITH) to Rn (set by FROM) instead. According to fullsnes, it's the description of MOVES which is wrong.
External Links
- Official Nintendo documentation on FROM: 9.34 on page 2-9-48 of Book II
- Official Nintendo documentation on Register Prefixes: page 2-6-7 of Book II