Hi,
        There are various speed for 16f84a. earlier
ones operate at 4MHz, some operate at 10MHz and others
operate at 20MHz. So if you have 20MHz 16f84a, why
not!
for example
 16f84a-4I/P mean operate at the maximum speed of
4MHz.
 16f84a-10I/P mean operate at the maximum speed of
10MHz.
 16f84a-20I/P ==> 20MHz
The figure in front of I determines the maximum speed
that the controller can operate. good luck...

Rgds,
T.N.K

--- dave vanhorn <dvanhorn@CEDAR.NET> wrote:
> At 08:45 PM 1/9/2002 +0800, Derek Chan wrote:
> >The manual for the PIC16F84 shows crystal for up to
> 10MHZ
> >
> >If I want to use higher crystals 19.6608MHz, can
> anybody recommend the
> >capacitors to put in for the oscillators ? Is there
> any special circuit
> >required ? Any help will be appreciated
>
> The crystal determines the capacitors.
> Get the data sheet on the crystal.
>
> --
> http://www.piclist.com hint: The PICList is archived
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> ways.  See http://www.piclist.com/#archives for
> details.
>
>


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