On 28 December 2011 16:38,  <alan.b.pearce@stfc.ac.uk> wrote:
>> I can?t seem to figure out how to write to OSCCON as if it were a
>> simple register. I?ve included the p24Hxxxx.h header file, but can?t
>> seem to do simple things like ?OSCCON.OSWEN =3D true;?. Am I missing
>> something?
>
> IIRC there is an unlock sequence for OSCCON that you have to perform befo=
re modifying the register. C30 has a macro to handle this easily.

__builtin_write_OSCCONL
Description: Unlocks and writes its argument to OSCCONL.
Prototype: void __builtin_write_OSCCONL(unsigned char value);
Argument: value character to be written
Return Value: None.
Assembler Operator
/ Machine
Instruction*:
mov #0x46, w0
mov #0x57, w1
mov __OSCCON, w2
mov.b w0, [w2]
mov.b w1, [w2]
mov.b value, [w2]
Error Messages None.
* The exact sequence may be different.


__builtin_write_OSCCONH
Description: Unlocks and writes its argument to OSCCONH.
Prototype: void __builtin_write_OSCCONH(unsigned char value);
Argument: value character to be written
Return Value: None.
Assembler Operator
/ Machine
Instruction*:
mov #0x78, w0
mov #0x9A, w1
mov __OSCCON+1, w2
mov.b w0, [w2]
mov.b w1, [w2]
mov.b value, [w2]
Error Messages None.
* The exact sequence may be different.



--=20
Martin K.
--=20
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