To all that replied and told me about the need for using a resistor and
capacitor with the 16F877 in RC mode, since the 16F877 does not have an
internal oscillator (I thought it did..), thanks... It now
works correctly! I appearently did not see that when I was skimming
through the datasheet (which I obviously should have) :(


Nathan

On Sat, 18 Jan 2003, Olin Lathrop wrote:

> > I was under the impression when I specify RC Oscillator, that uses the
> > internal oscillator of the PIC, so I do not need to use an external
> > oscillator.
>
> Ah, there's the problem.  The 16F877 doesn't have an internal oscillator.
> See Section 12.2 "Oscillator Configurations" on page 121 of DS3029C
> "PIC16F87x Data Sheet".  RC oscillator mode means just that: you have to
> hook up an R and C.  Especially for breadboarding, I just set the
> oscillator to HS mode and use a 20MHz crystal and two 22pF caps.
>
>
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