>
>
> In this case, 40MHz will be 1.7% high, ie sampling too fast. On
> a few bytes, you could work out how many, this probably wouldn't
> be a problem, but the PC and PIC will drift apart on longer strings
> without a periodic re-synch


The re-sync happens on the start bit of every byte.
1.7% isn't enough to cause a problem.
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