Better designed internal oscillator, less sensitive to temperature and
voltage change (perhaps temperature compensated?).

Don't count on it for RS-232 and other timing applications if you plan
to run it to its extremes in temperature or voltage - it can vary as
much as +/-3.2% or so ( see figures 18-39 to 18-42 for graphs) which
is greater than the 2.5% I usually restrict myself to when talking
about RS-232 acceptable clock error.

Still, if you drive it with a reasonable voltage, and stay within a
restricted temperature range, then it should work reasonably well (ie,
+/- ~1%).

-Adam

On Wed, Jun 11, 2008 at 10:18 PM, Matthew Miller <namiller2@naxs.net> wrote:
> Hi everyone, this is just a curiosity question that came to me. Many of the
> newer PICs have this Precision Internal Oscillator and it does seem to be
> pretty good. I know that with a 12F629, I had set the OSCCAL register in
> order for a software UART to work correctly. But, I'm now using a 16F689 and
> with this Precision Internal Oscillator the built in EUSART works just fine
> without any calibration.
>
> So my question is this: how has the technology changed? Is a mini ceramic
> resonator present in these new chips? :) Or is it just a better designed RC
> oscillator?
>
> Thanks for any insight! Matthew
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