A rough and ready formula for the pic clock frequency for values of R and
C is:

   F=1/(4RC)    (instruction time 1/F or 2 x 1/F if a branch is involved)

Bearing in mind that R should not be >100k and C not <20pF (for 16F84)
Also the frequency will depend on temperature and component tolerance
etc. If you want a more precise clock frequency use a Xtl or a resonator.

------- John PB

          -----  John P. Brown      J.P.Brown@bradford.ac.uk ----
           \            --- Witty remark goes here ---         /
            --------------------------------------------------

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