>
>
> FWIW I didn't have the CKOPT bit selected on a whole bunch of engineering
> devices running with a 7.3728MHz resonator, and never experienced any
> issues that I could relate to the clock.  Better safe than sorry though.


I'd shipped a whole bunch before we discovered this little feature.
One sneaky indicator, is that the baud rate is sometimes a little wrong,
maybe 1% or so, but using a baud rate xtal, there shoud be no measurable
error.

Also I did experience numerous EEPROM corruption problems, which was down to
> my own ignorance.  I had selected a suitable brown out voltage in the
> configuration fuses, but hadn't actualy enabled the brown out reset!  Once
> done, all EEPROM issues were magicaly resolved.  I also have location 0 as a
> sacrificial lamb, if you can spare the one location I think it's a
> worthwhile precaution.


I've done this on a lot of platforms, way before atmel. That register always
points SOMEWHERE..  Sometimes you can point it to illegal spaces, but that
may not be all that safe either.
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