>> The 12f675 has several robustness features (brown out detect, power
>> on timer, watchdog), all of which I have turned off at the moment,
>> under the assumption that the basic internal reset would be 
>> sufficient.
>> Apparently not.

The features are there because they are often enough needed in real 
world applications. Watchdog can be a pain or useless if not driven 
well but brownout detect is utterly invaluable and invisible in most 
cases and power on timer usually does little harm.



        RM

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