Hi Poul,
I would guess the 100ns granularity should be already overkill, giving
an error in the order of 1e-7. To be compared with mains instability of
>1e-5:
http://www.leapsecond.com/pages/mains/
I would try to keep it as simple as possible... maybe even only one IC,
there exist USB-capable PIC controllers (don't know about AVR, but
likely as well).
Regards,
Achim
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