We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
IBT: Difference between revisions
From SnesLab
(added immediate admode) |
(added image) |
||
| (8 intermediate revisions by the same user not shown) | |||
| Line 26: | Line 26: | ||
|[[Sign Flag|S]] | |[[Sign Flag|S]] | ||
|[[CY]] | |[[CY]] | ||
|Z | |[[Zero Flag|Z]] | ||
|+ | |+ | ||
|0 | |0 | ||
| Line 37: | Line 37: | ||
|} | |} | ||
'''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 ==== | |||
<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 === | ||
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