----- Original Message ----- 
From: "Bob Blick" <bblick@sonic.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, May 13, 2005 6:14 PM
Subject: Re: [PIC] Error % charts of PIC USART ?


> > In the datasheet of 18F2455 we have
> > Table 20-3 Baud Rates For Aynchronous Modes (USART module)
> > (I guess other pics would have the same thing as well)
> > The errors seem to range from 0.16% up to -45.75%. Are all these
> > values valid, or should I be aiming at a certain percentage, I am
> > confused?
>
> Usually if I am designing something using the usart, I choose a crystal
> frequency that divides well. For the 16-series PICs and PC baud rates,
> 19.6608 MHz is readily available.

This seems to fit well in the formula of the 18 series, I think

>
> For the 18 series with PLL, you will need to choose something 10MHz or
less.
>
> Cheers,
>
> Bob
>
>
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