>
> USART is great, great when you have time for do something else than the
> real
> thing. But the whole thing depends on timing, number of instructions etc
> which is not very nice I know -- sometimes modifing only one instruction
> takes as long as an hour. But that's my problem, I wanted to put it into
> the
> smallest PIC :-) -- 10F2xx, no interrupts, only 1 8bit timer without
> knowing
> that is overflowed etc.


I would be a bit scared doing a serial interface on a PIC using its internal
oscillator. In the past I've had issues of drift (not sure where the drift
came from, but i guess it could be temperature or just the phase of the
moon) where I had to readjust the speed of USART to compensate for a change
in the oscillator frequency. Of course, you can calibrate the 10F200, and
its oscillator might be more accurate than the one in the 16F628A and the
16F688, so it might be less of an issue. Also, you are coding it yourself,
so your base accuracy could be higher.

Greetings,
Maarten Hofman.
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