On Mon, May 02, 2005 at 01:54:06PM +0200, Wouter van Ooijen wrote:
> > So, should the "INTRC" be accurate enough?
> 
> I doubt it. Check the datasheet, if it promises 1% accuracy it is OK.
> But it will be much batter than an external RC oscillator.

Not a chance.

You simply can't do reliable serial at any resonable bit rate using RC.

We've had some debates about the accuracy of the nanowatt internal 
oscillator, which is supposedly tuned to within 2%.

But the best thing to do is to test with a crystal or resonator.

The more variables you lock down (i.e. clock rate) the more likely you
can find your problem.

BAJ
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