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FROM (Super FX): Difference between revisions

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(implied type 1)
(Added note on execution of MOVES.)
 
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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 WITH acting as the source and FROM as the destination.
'''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.
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FROM Rn
FROM Rn
</pre>
</pre>
==== Example ====
To set R<sub>2</sub> as the source register, run:
FROM R<sub>2</sub>


=== See Also ===
=== See Also ===
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* [[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