> >
> >Non-deterministic execution is NOT a feature.  :)
>
> It must be a feature, Microchip included it on many of their later micros, even running at default clock speed :(  I seem get a new errata every week from them.  Seems like the Microsoft beta testing strategy, but the silicon is a lot harder and slower to get fixed.


If you leave the CKOPT fuse in an AVR in the default state, and then
use an external crystal or resonator, you get much the same effect.
The default mode is a "vittoz" low power oscillator, which has barely
enough amplitude to clock the chip.  Symptoms include slightly slow
baud rates, undebuggable errors that happen once in a few seconds of
operation, emulation problems like doing 2-10 instructions on a
"single step", without actually DOING some/most/all of them, other fun
things.

Why that's the default state is something that I've never heard a good
explanation of.
I've helped a number of people with products they were shipping that
had this problem, with wierd symptoms in some systems, but not all.
Funny how things completely clear up when the clock is actually high
enough amplitude to run the system.
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