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IBT: Difference between revisions
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'''IBT''' (Immediate Byte | '''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 ==== | ==== Syntax ==== | ||
<pre> | <pre> | ||
IBT Rn, #pp | IBT Rn, #pp | ||
</pre> | </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 === | ||
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