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IBT: Difference between revisions
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!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
|'''Addressing Mode''' | |||
|'''Opcode''' | |'''Opcode''' | ||
|'''Length''' | |'''Length''' | ||
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|'''Cache Speed''' | |'''Cache Speed''' | ||
|+ | |+ | ||
|[[Immediate]] | |||
|Anpp | |Anpp | ||
|2 bytes | |2 bytes | ||
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!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|B | |[[B Flag|B]] | ||
|ALT1 | |[[ALT1]] | ||
|ALT2 | |[[ALT2]] | ||
|O/V | |[[O/V]] | ||
|S | |[[Sign Flag|S]] | ||
|CY | |[[CY]] | ||
|Z | |[[Zero Flag|Z]] | ||
|+ | |+ | ||
|0 | |0 | ||
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|. | |. | ||
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'''IBT''' (Immediate Byte Transfer) is a [[Super FX]] instruction that loads an immediate byte into the low byte of a specified general register. The register's upper eight bits will be sign-extended (copied) from bit 7, effectively loading a signed 8-bit value. | |||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | |||
<pre> | |||
IBT Rn, #pp | |||
</pre> | |||
where pp may be from -128 to 127. Any of the 16 general registers can be specified. | |||
==== Example ==== | |||
IBT R<sub>8</sub>, #4 ; 0004h -> R<sub>8</sub> | |||
IBT R<sub>8</sub>, #-128 ; ff80h -> R<sub>8</sub> | |||
IBT R<sub>8</sub>, #0A4h ; ffa4h -> R<sub>8</sub> | |||
==== Trivia ==== | |||
The word "integer" is misspelled in the official manual page for IBT. | |||
[[File:ibt.png]] | |||
=== See Also === | === See Also === | ||
* [[IWT]] | * [[IWT]] | ||
* [[LDA]] | * [[LDA]] | ||
* [[LDX]] | |||
* [[LDY]] | |||
=== External Links === | === External Links === | ||
* Official Nintendo documentation on IBT: [https://archive.org/details/SNESDevManual/book2/page/ | * Official Nintendo documentation on IBT: 9.41 on [https://archive.org/details/SNESDevManual/book2/page/n216 Page 2-9-60 of Book II] | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Super FX]] | [[Category:Super FX]] | ||
[[Category:GSU_Control_Instructions]] | [[Category:GSU_Control_Instructions]] | ||
[[Category:Two-byte Instructions]] | |||
Latest revision as of 02:24, 16 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Immediate | Anpp | 2 bytes | 6 cycles | 6 cycles | 2 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
IBT (Immediate Byte Transfer) is a Super FX instruction that loads an immediate byte into the low byte of a specified general register. The register's upper eight bits will be sign-extended (copied) from bit 7, effectively loading a signed 8-bit value.
The ALT0 state is restored.
Syntax
IBT Rn, #pp
where pp may be from -128 to 127. Any of the 16 general registers can be specified.
Example
IBT R8, #4 ; 0004h -> R8 IBT R8, #-128 ; ff80h -> R8 IBT R8, #0A4h ; ffa4h -> R8
Trivia
The word "integer" is misspelled in the official manual page for IBT.
See Also
External Links
- Official Nintendo documentation on IBT: 9.41 on Page 2-9-60 of Book II