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fuses config

 
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Reto



Joined: 05 Jan 2005
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fuses config
PostPosted: Wed Jun 08, 2005 11:58 pm     Reply with quote

Hello
Is it possible to set the defines of the fuses by myself. I don't understand why the ccs not used config bits are set to zero and not to 1. I guess it's commen to set not used values to 1. Not used flash bits are 1 when you will read it back. You can see this on microchip assembler and hi-tech compiler. there is it also possible to define it by the user itself. Is it also possible here. I can't find the define file in the ccs.
ckielstra



Joined: 18 Mar 2004
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PostPosted: Thu Jun 09, 2005 1:36 am     Reply with quote

The CCS compiler uses the #fuses command for defining the processor fuses, see the manual.

Applicable parameters for the #fuses command depend on the processor you are using, study the header file for your processor in the picc/devices directory.
An explanation of the parameters can be found in the file picc/fuses.txt.
Reto



Joined: 05 Jan 2005
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fuses defines
PostPosted: Thu Jun 09, 2005 2:31 am     Reply with quote

Sorry maybee my question was not so good. Is there any possibility to define the definitions of the fuses by myself. As example EC_IO is in the ccs 0x25. You can see it in the hexfile. But actually it should be 0xFD. The not used Bits 7,6,4,3 should be 1 and not zero.
ckielstra



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PostPosted: Thu Jun 09, 2005 3:40 am     Reply with quote

have a look at picc/chipedit.exe, this allows you to change the bitvalues.

Quote:
The not used Bits 7,6,4,3 should be 1 and not zero.

I had a quick look at register definitions for the config1h register for some chips, and the ones I checked have bits 7,6,4,3 marked as 'unimplemented, read as 0'.

Which chip do you have that requires the unused bits to be set to a '1'? This is unusual.
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