Actually, what is the real percentage of the internal osc preciosity? I
know, 1-2% according the manual but seriously :-)
I do not mind if it's running in a different freq than 4MHz -- between
3.something and 4.something is OK as long as after I switch it on it keeps
the freq.

Anyway, I've just put that tool together, and will see if I could do
something in the debugger, and considering to keep your advise. I have a
spare 20MHz crystal at home and a MAX232 so may be I will put that debug
circuit together this weekend.

Thanks,
Tamas


On 01/09/06, Maarten Hofman <cashimor@gmail.com> wrote:
>
> >
> > 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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