> I've been following this thread with interest, a bootloader that just uses
> MCLR is very appealing.  However, I can't see how the bootloader would
> differentiate a valid reset (from e.g. a rest button or supervisor) from a
> bootloading attempt.

Timing.  If MCLR is left high long enough, the bootloader will run the main
code if it passes the checksum test.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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