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IWT (Super FX): Difference between revisions
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'''IWT''' is a [[Super FX]] instruction that loads two immediate bytes. | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | |||
|+ | |||
|'''Addressing Mode''' | |||
|'''Opcode''' | |||
|'''Length''' | |||
|'''ROM Speed''' | |||
|'''RAM Speed''' | |||
|'''Cache Speed''' | |||
|+ | |||
|[[Immediate]] | |||
|Fnxxxx | |||
|3 bytes | |||
|9 cycles | |||
|9 cycles | |||
|3 cycle | |||
|} | |||
{| class="wikitable" style="float:right;clear:right;width:30%" | |||
!colspan="9"|Flags Affected | |||
|+ | |||
|[[B Flag|B]] | |||
|[[ALT1]] | |||
|[[ALT2]] | |||
|[[O/V]] | |||
|[[Sign Flag|S]] | |||
|[[CY]] | |||
|[[Zero Flag|Z]] | |||
|+ | |||
|0 | |||
|0 | |||
|0 | |||
|. | |||
|. | |||
|. | |||
|. | |||
|} | |||
'''IWT''' (Immediate Word Transfer) is a [[Super FX]] instruction that loads two immediate bytes into a register. Any register from R<sub>0</sub> to R<sub>15</sub> may be specified. | |||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | |||
<pre> | |||
IWT Rn, #xx | |||
</pre> | |||
==== Example ==== | |||
When: | |||
IWT R<sub>0</sub>, #4583h | |||
is executed: | |||
R<sub>0</sub> = 4583h | |||
=== Trivia === | |||
The official Super Nintendo development manual mispells the mnemonic as "ITW" in the opcode diagram.<sup>[1]</sup> The low byte of the immediate value is loaded before the high byte. | |||
=== See Also === | === See Also === | ||
* [[IBT]] | * [[IBT]] | ||
* [[LDA]] | * [[LDA]] | ||
* [[LDX]] | |||
* [[LDY]] | |||
* [[LEA]] | |||
=== External Links === | |||
# Official Nintendo documentation on IWT: 9.43 on [https://archive.org/details/SNESDevManual/book2/page/n218 Page 2-9-62 of Book II] | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category: | [[Category:Super FX]] | ||
[[Category:Data Transfer Instructions]] | |||
[[Category:Three-byte Instructions]] | |||
Latest revision as of 01:55, 16 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Immediate | Fnxxxx | 3 bytes | 9 cycles | 9 cycles | 3 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
IWT (Immediate Word Transfer) is a Super FX instruction that loads two immediate bytes into a register. Any register from R0 to R15 may be specified.
The ALT0 state is restored.
Syntax
IWT Rn, #xx
Example
When:
IWT R0, #4583h
is executed:
R0 = 4583h
Trivia
The official Super Nintendo development manual mispells the mnemonic as "ITW" in the opcode diagram.[1] The low byte of the immediate value is loaded before the high byte.
See Also
External Links
- Official Nintendo documentation on IWT: 9.43 on Page 2-9-62 of Book II