[TriEmbed] Atmega fast startup

[Pete Soper]

This was an experiment to see the best case cold start latency. I got it down to five machine instructions plus the internal startup of the on-chip oscillator so Shane and others in the discussion can see the answers to the questions left hanging: how fast the RC-based clock gets going and whether the latency tends to be deterministic. For one chip, one VCC and one temperature a half dozen repetitions suggest it is deterministic. Pete

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