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>Resonators are accurate enough.  Most are better than 3% over temperature
>and voltage, INCLUDING ageing.  That results in a maximum error of 1/3 bit.

To pick a nit, that's not the maximum error if you're bit-banging.  From
the design point of view, you'd have to consider that the minimum error.

You also have to consider the accuracy of your algorithm, and the effects
of any interrupts you may have turned on. Unfortunately, nobody else can
tell you what that will be, you'll have to walk the code yourself.


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