> 1. Can a 16F84-20/P be run on lower spped of  4 Mz or 1 Mz. What will be
the
> oscillator setting for 4 Mz (XT or HS)

All PICs are fully static, and therefore work with any clock from DC to the
specified maximum.  Of course this isn't true of the crystal driver.  XT
should work at 4MHz, see manual.


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