I'm currently doing this with a 16F, but just for testing on an =20
existing prototype PCB that does not have provision for a crystal.  It =20
works for my purpose for now (logic analyzer says I'm getting 9613 =20
baud), but I had figured if I needed to, I could adjust the =20
oscillator, though there would still be variations due to temperature =20
changes.  See AN244 here on how to use OSCTUNE... =20
http://ww1.microchip.com/downloads/en/AppNotes/00244a.pdf

Cheers,
-Neil.



Quoting Steven Ramon <sramon@s2pros.com>:

>
> I am planning to use a PC18F2455 for RS232. To help save cost and
> reduce complexity, I want to use the internal oscillator. However,
> I'm concerned about baud rate error. We'll be operating at 9600 8N1
> and 5V signal levels. Can someone point me to documentation that
> discusses using the internal oscillator with RS232. I've searched for
> an application note, but haven't found one. Please go easy on me, as I
> have never used this forum before and don't even know if it is going
> to get through.
>
> Thanks,
>
> Steven
>
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