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GETBH (Super FX): Difference between revisions

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|6 to 10 cycles
|6 to 10 cycles
|6 to 9 cycles
|6 to 9 cycles
|2 to 6 cycle
|2 to 6 cycles
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|[[Sign Flag|S]]
|[[Sign Flag|S]]
|[[CY]]
|[[CY]]
|Z
|[[Zero Flag|Z]]
|+
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'''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.
'''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]].
The reason the cycle times can vary is because of the [[ROM buffer]].  The [[ALT0]] state is restored.
 
The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]].  Otherwise, R<sub>0</sub> serves as the default.


==== Syntax ====
==== Syntax ====
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GETBH
GETBH
</pre>
</pre>
[[File:gsu_getbh.png]]


==== Example ====
==== Example ====
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* [[GETBL]]
* [[GETBL]]
* [[GETBS]]
* [[GETBS]]
* [[GETC]]
* [[MERGE]]
* [[ALT1]]
* [[ALT1]]


=== External Links ===
=== External Links ===
* Official Super Nintendo development manual on GETBH: 9.36 on [https://archive.org/details/SNESDevManual/book2/page/n207 Page 2-9-51 of Book II]
* Official Super Nintendo development manual on GETBH: 9.36 on [https://archive.org/details/SNESDevManual/book2/page/n207 page 2-9-51 of Book II]


* example: [https://archive.org/details/SNESDevManual/book2/page/n208 page 2-9-52 of Book II], lbid
* example: [https://archive.org/details/SNESDevManual/book2/page/n208 page 2-9-52 of Book II], lbid
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[[Category:Data Transfer Instructions]]
[[Category:Data Transfer Instructions]]
[[Category:Two-byte Instructions]]
[[Category:Two-byte Instructions]]
[[Category:Expects Sreg/Dreg Prearranged]]

Latest revision as of 22:27, 16 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 cycles
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. The ALT0 state is restored.

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R0 serves as the default.

Syntax

GETBH

gsu getbh.png

Example

Let:

(ROM buffer) = 75h
Sreg : R2
Dreg : R6
R2 = 4abdh

After executing GETBH:

R6 = 75bdh

See Also

External Links