> I would be a bit scared doing a serial interface on a PIC 
> using its internal oscillator. 

But you are not limited to asycnhronous NRZ encoding - you can use any
encoding you like, optimized for speed/size as you like. There are
numerous encoidings that can tolerate >>10% clock uncertainty. Have
another PIC decode the data and send it out using its UART. Maybe with a
FIFO inbetween. For electrical isolation use an IR LED and a TSOP
receiver (OK, abit slow) or IRDA.

Wouter van Ooijen

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