Post by thread:RC oscillator concerns?

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'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