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GETBL (Super FX): Difference between revisions

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'''GETBL''' (Get Byte Low) is a [[Super FX]] instruction that loads one byte from the [[ROM buffer]] into the low byte of the [[destination register]].  GETBL also loads the high byte of the [[source register]] into the high byte of the destination register.
'''GETBL''' (Get Byte Low) is a [[Super FX]] instruction that loads one byte from the [[ROM buffer]] into the low byte of the [[destination register]].  GETBL also loads the high byte of the [[source register]] into the high 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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GETBL
GETBL
</pre>
</pre>
[[File:gsu getbl.png]]


==== Example ====
==== Example ====
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* [[GETBH]]
* [[GETBH]]
* [[GETBS]]
* [[GETBS]]
* [[GETC]]
* [[ALT2]]
* [[ALT2]]



Latest revision as of 22:19, 16 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) 3EEF 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 . . . .

GETBL (Get Byte Low) is a Super FX instruction that loads one byte from the ROM buffer into the low byte of the destination register. GETBL also loads the high byte of the source register into the high 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

GETBL


gsu getbl.png

Example

Let:

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

After executing GETBL:

R6 = 4a75h

See Also

External Links