Adam Field wrote:
> Those are the absolute maximum ratings you can get away with without
> damaging the part. It doesn't mean it will work at those values.
>
> Look at section 17.1, you'll find a chart of Fosc vs min and max Vdd.
> It's in the next two pages from where you found the absolute maximum
> values.
>
> You can go to 2.0V if you're running at 8MHz. 3.0V @ 10Mhz and 4.5V @ 20Mhz.
>   

Great stuff, thanks.

If I run it at 8 MHz and put something like 3 volts on Vdd (e.g. 3 volts 
from two AA batteries in series), then what voltage will I get on an 
output pin when it's set to high? Will I still get 5 volts, or will I 
only get 3 volts?

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