> I was originally going to use a 16F628 but 
> then I realized the 16F628 doesn't have an RC oscillator mode 
> which the original circuit uses.

are you sure is does not?

> It uses a 5k resistor and 20pF capacitor.  Where can I see 
> what frequency the chip will run at, and will the 16F84 have 
> the same speed with this configuration as the CF745?

why not change to the internal oscillator, a resonator, or even a
crystal?

Wouter van Ooijen

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