>I'm doing async comms between two PIC's at 19200 baud, and
>the variation above is enough to give me problems. Matching
>two PIC's from the above test means comms works well, even
>with considerable temperature differences - but it's a pain.

Does it have to be async comms? Could you use the method I posted details of
last week, that TI use for their calculators? Then the frequency differences
do not matter.

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