Thankyou, thats a great help, I'll try that!.
Chris P.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Scott Dattalo
Sent: 23 September 2000 23:22
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC] PIC16C64B Development board.


On Sat, 23 Sep 2000, Chris Pringle wrote:

> Hmm, you know your stuff. Well, I'm trying to clock this thing at 10MHz,
but
> with not much succes. The book says to use a Resistor in series with a
> capacitor with OSC1 connected between the 2. I used values of 10K and 50pF
> for the Res. and Cap. Are these ok? I'm currently using MPLAB with a
> PICSTART Plus. The manual written by Microchip seems to be absolutly fine,
> except I couldn't get it to work. Although, one of the pieces of
literature
> from Microchip seems to say something slightly different (values differ),
> however it was rather old, so I ignored it and used the later document.
The
> latest copy says to use values between 3K and 100K and anything above
20pF.
> If what I've used is correct, then my problem is more likely to be a
circuit
> error which I can't find.
>

10MHz !

I never tried to go that high with an RC circuit. Has anyone else? Try
backing
off to say 100 or 200 kHz and see if that's easier. I'm not sure how
accurate
you wish to get the clock, but 50pF is relatively small and there is going
to be
several pF of stray capacitance.

BTW, in RC mode you should see fclk/4 on osc2. You may want to see if that
is
really there. If it is, then you know that the clock is running. Then after
that it's all software...

Scott

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