I'm forwarding this question for a friend of mine who is looking at
retrofitting an existing product for lower power operation. The budget
simply doesn't allow for code re-write at this point so the current chip
MUST be used.

Question for the PIC list:  Will the PIC16F57 run at 12 mHZ at 3.3 volts?
Probably yes, but at what level of reliability?  Has this been done in
PRODUCTION systems?  How many in the field, and what level of returns for
non-operation?  (sort of a validation question).

Our alternative is to run at 3.3, but a 6 MHZ which slows down the '57, cuts
the baud rate to 4800, and otherwise should have minimal effects.

My data from prior experience shows that 12mHz is pushing the 57: 6mHz is
more likely.
http://www.sxlist.com/techref/scenix/picreplace.htm 

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