My reset line MCLR is disabled in the Configuration bits. But I still
have it pulled down to ground through a 10k resistor(not sure about
the value, will have to look it up)


On 8/16/06, Russell McMahon <apptech@paradise.net.nz> wrote:
> >I am using a PIC18F1320 with the MPLAB compiler. I wrote the code,
> >and
> > while testing it I get a set of outputs with the oscilloscope, but
> > when i disconnect the oscilloscope, the outputs are different.
> > For example, I read in a byte over the serial port and compare it
> > with
> > a variable. If it matches then I light an LED. With the oscilloscope
> > connected the LED never lights, without it it does.
>
> You may have an input driven by a high impedance. Oscilloscope loading
> may affect this. It is most unlikely that oscilloscope loading will
> affect a properly configured output.
>
> Oscilloscope load is typically of the order of 1 Mohm and 10 pF. It
> can affect oscillator operation under marginal conditions but usually
> only if connected to the oscillator circuit in some way.
>
> Is your reset line properly managed?
>
>
>
>         Russell
>
>
>
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