Hi Jeethu,

You may consider using the 16F628 which has an internal 4MHz oscillator.
This is ideal for applications that do not require a highly accurate
clock.

The additional benefit is that the parts count gets reduced!

Regards,
Bala

> -----Original Message-----
> From: Jeethu Rao [mailto:jeethur@SANCHARNET.IN]
> Sent: Thursday, August 16, 2001 11:59 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: RC Oscillator on a 16f84
>
>
> Hi,
>
> All these days, I've been using PICs with Crystal Oscillators.
> But now, I've got an application which needs a cheap and dirty
> RC Oscillator. The 16f84 data sheet only says:
>
> <QUOTE>
> Recommended values: 5 kW # Rext # 100 kW
> Cext > 20pF
> </QUOTE>
>
> I tried a resistor of 15K and a Cap of 0.1 mfd.
> But it does not work.
>
> Could someone advise me on how to get this working
> and how to calculate the frequency for a given value of
> R and C ?
>
> Thanks in Advance,
>
> Jeethu Rao
>
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