>I'm working on my first PIC project.  From the samples in the Parallax
>documentation, I've been able to hack out enough to get by.  However,
>I can't find any references on the RC oscillator.  Is there a simple
>formula for component selection?  Anything else I should be aware of?
>
>Thanks...
>
>

I had the same problem with the Parallax documentation.  Here is the table I
found in the Microchip Data Book.


Cext            Rext            Avg Fosc @ 5V, 25'C     +/- %
--------        ----------      -------------------     ------
20pF            3.3k            4.973   Mhz             27
                5k              3.82    Mhz             21
                10k             2.22    Mhz             21
                100k            262.15  Khz             31

100pF           3.3k            1.63    Mhz             13
                5k              1.19    Mhz             13
                10k             684.64  Khz             18
                100k            71.56   Khz             25

300pF           3.3k            660.0   Khz             10
                5k              484.1   Khz             14
                10k             267.63  Khz             15
                160k            29.44   Khz             19