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Bootloader

 
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Heath



Joined: 21 Dec 2007
Posts: 41

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Bootloader
PostPosted: Wed Apr 22, 2009 9:41 am     Reply with quote
Is it possible for a bootloader to change all configuration bits?
ckielstra



Joined: 18 Mar 2004
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Location: The Netherlands

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PostPosted: Wed Apr 22, 2009 3:04 pm     Reply with quote
No. This is part by design and partly on purpose, for example the PROTECT fuses are something that you don't want the user to be able to reset.

The bootloader can program fuses from the default value '1' to a '0'. The other way around can only be achieved by erasing the whole chip.

Newer chips, like the PIC18F45J10 family, do not use persistent memory registers to store configuration information. But here the same is true, a bit can only be set to '0' once. Resetting the configuration bit to a '1' requires a whole chip erase.
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