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GETBH (Super FX): Difference between revisions
From SnesLab
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==== Example ==== | |||
Let: | |||
(ROM buffer) = 75h | |||
S<sub>reg</sub> : R<sub>2</sub> | |||
D<sub>reg</sub> : R<sub>6</sub> | |||
R<sub>2</sub> = 4abdh | |||
After executing GETBH: | |||
R<sub>6</sub> = 75bdh | |||
=== See Also === | === See Also === | ||
Revision as of 19:29, 8 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 3DEF | 2 bytes | 6 to 10 cycles | 6 to 9 cycles | 2 to 6 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
GETBH (Get Byte High) is a Super FX instruction that loads one byte from the ROM buffer into the high byte of the destination register and the low byte of the source register into the low byte of the destination register.
The reason the cycle times can vary is because of the ROM buffer.
Syntax
GETBH
Example
Let:
(ROM buffer) = 75h Sreg : R2 Dreg : R6 R2 = 4abdh
After executing GETBH:
R6 = 75bdh
See Also
External Links
- Official Super Nintendo development manual on GETBH: 9.36 on Page 2-9-51 of Book II
- example: page 2-9-52 of Book II, lbid