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ROMB (Super FX): Difference between revisions
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''' | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | |||
|+ | |||
|'''Addressing Mode''' | |||
|'''Opcode''' | |||
|'''Length''' | |||
|'''ROM Speed''' | |||
|'''RAM Speed''' | |||
|'''Cache Speed''' | |||
|+ | |||
|[[Implied]] (type 1) | |||
|3FDF | |||
|2 bytes | |||
|6 cycles | |||
|6 cycles | |||
|2 cycles | |||
|} | |||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!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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|. | |. | ||
|} | |} | ||
'''ROMB''' is a [[Super FX]] instruction that moves the low byte of the [[source register]] into [[ROMBR]]. | |||
The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | |||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | |||
<pre> | |||
ROMB | |||
</pre> | |||
==== Example ==== | |||
Let: | |||
S<sub>reg</sub> : R<sub>5</sub> | |||
R<sub>5</sub> = 0046h | |||
After executing ROMB, the ROMBR becomes 46h. | |||
=== See Also === | |||
* [[RAMB]] | |||
* [[ALT3]] | |||
=== External Links === | |||
* Official Nintendo documentation on ROMB: 9.75 on [https://archive.org/details/SNESDevManual/book2/page/n260 Page 2-9-104 of Book II] | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category: | [[Category:Super FX]] | ||
[[Category:Bank Set-up Instructions]] | |||
[[Category:Two-byte Instructions]] | |||
[[Category:Expects Sreg/Dreg Prearranged]] | |||
Latest revision as of 00:21, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 3FDF | 2 bytes | 6 cycles | 6 cycles | 2 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
ROMB is a Super FX instruction that moves the low byte of the source register into ROMBR.
The source register should be specified in advance using WITH or FROM. Otherwise, R0 serves as the default.
The ALT0 state is restored.
Syntax
ROMB
Example
Let:
Sreg : R5 R5 = 0046h
After executing ROMB, the ROMBR becomes 46h.
See Also
External Links
- Official Nintendo documentation on ROMB: 9.75 on Page 2-9-104 of Book II