Thanks Steve,

I think you picked up on all my little tricks in this one.

Is there any baudrate limitation test report for different OSC speed?
No, not really.
I've run it at 115200 with 32mhz
19200 with 4mhz.

I was a bit worried about what people might try, so I put in ERROR's if you try to use a baudrate that isn't suitable for your OSC freq.
But those are really for "IDEAL" conditions.

The timing will still be affected by the interrupts. The difference is that only the rise and fall times will vary. The overall bit timing will stay consistant (as long as the INT handlers aren't too long). So Lower baud rates will still be "more stable".
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