On Wed, 18 May 2011 21:24 -0500, "Steven Ramon" wrote:
>=20
> 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 =20
> have never used this forum before and don't even know if it is going =20
> to get through.

Hi Steven,

Welcome to the Piclist!

I think most of us would be in general agreement that the internal
oscillator will be accurate enough for RS232 if it is a "room
temperature" application. Page 388 of the data sheet shows +- 2% max at
room temperature but it's much worse over the full temperature range.

Cheerful regards,

Bob

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