On 6/12/08, Matthew Miller <namiller2@naxs.net> wrote:
> But, I'm now using a 16F689 and
> with this Precision Internal Oscillator the built in EUSART
> works just fine without any calibration.
>

Actually you can still use OSTUNE register to change the
internal RC oscillator frequency (HFINTOSC only, not the
LFINTOSC) if you really want for 16F689.

Microchip has several implementations of tuning the
internal RC oscillator frequency. Some of them use
OSCCAL written in one of the Flash Bytes. Some
of them use the OSTUNE register, some of them
use one or two configuration words (0x2008 or
0x2008/2009).

Xiaofan
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist