On Wed, 21 Jul 2010 13:24:47 -0400, "V G" said:

I like the shiny new moniker :)

> I used a simple program that calculates PIC UART configuration
> register values based on the clock frequency and desired bit rate. I
> selected various common frequencies such as 16 MHz, 20 MHz, and so on,
> but all of them resulted in the program calculating a non-zero error
> percentage value (0.16% at 20 MHz and 9600 bits/s). A screenshot of
> the program can be viewed here:
> http://img249.imageshack.us/img249/8761/screenshotno.png
> 
> Is this non-zero error value acceptable? Will it cause reliability
> issues? Does it need to be avoided, and if so, how?

It's not a problem for communication, up to about .5% error is
acceptable.

You can use 19.6608 MHz crystals if you want perfect timing. That is a
standard value.

Cheerful regards,

Bob

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