> > Does anybody have experiences to share about overclocking
> > 40MHz-rated PIC18F parts to about 44.5MHz?

Some time last year I posted about an 18F452 that I accidentally
connected an 18.432MHz xtal to and then turned the PLL on. It
did appear to run OK with some very simple timing tests at
73.728MHz but I would never expect to try that in production
nd without a complete battery of tests on all the modules it's
impossible to say whether it was a fully functional device at that
speed

Although you've been advised that 44.5MHz is out of spec, that
doesn't necessarily mean it won't work reliably. Just that if it
doesn't you've no one to blame but yourself. I don't know what
Microchip's actual criteria are for specifications at the higher
frequencies, but at the bottom end you probably can overclock
parts. For example, a -04 part is guaranteed to run at 4MHz,
but came from the same batch as -10 parts, and failed the 10MHz
test. So it could run alright at 6MHz or 8MHz

It might very well be the case that some 40MHz parts will run
at 44.5MHz. You would have to sort out which ones will, and
with the functions you're using


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