> Which still leaves us here: If the chip says 4 MHz, it may die in strange
> and unexpected ways, at anything higher than 4 MHz.
>
> I wish someone from uChip would step in and make a definitive statement..

They have.  Read the data sheet.  4MHz parts are guaranteed to run up to
4MHz over the full range of the other parameters.  20MHz parts are
guaranteed to run up to 20MHz over the full range of the other parameters.
If you violate any of the specs, whether clock speed or something else,
there is no guarantee that the part will function as described.

For some reason a few "I'll spend a fortune to get something for nothing"
types on this list are questioning what they can get away with on the speed
spec.  The official answer has been and I'm sure will continue to be
"nothing".  I can't quite figure out what part of "nothing" they don't
understand.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

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