Kieran,

a few things I would recommend you to try.

1. scope probe has about 15pf cap in it so when you probe it
    that means you are adding 15 pf cap over OSC2 pin
    one side you have 30pf and the other side you have 45pf I am not
    sure what can 15pf do but it may not work if the voltage is low 3v.

    use 2 probes on each pin or add 15pf cap to make it same value see
    it helps.

2. use can oscillator for testing
3. remove 30pf caps for testing
4. increase the voltage to 5v for testing


sorry I have to go and maybe I will continue from home.

Andre




> Hi,
>
> Well, I got hold of a 'scope and checked out OSC2 - it's sitting at a DC
> level of 1.2V. Not moving at all. OSC1 is also constant - at 0.15V.
>
> What could this mean? The crystal is connected across OSC1 and OSC2, and
has
> a 30pF capacitance to ground on each leg. The ground is a plane layer in a
4
> layer PCB.
>
> I'm driving my circuit with a 3V power supply, and I've checked the power
> connections around the chip. /MCLR is high. Interestingly, the LED I've
> connected between RE0 and ground glows dimly when I turn the circuit on -
> why is this? (The PIC code is supposed to drive all of port E high when it
> starts executing, but I don't think it's getting this far, based on what I
> see at OSC1 and OSC2.)
>
> I've checked the configuration bits - they're set to HS oscillator with
LVP
> Enable off and Debug off.
>
> Any ideas?
>
> Kieran
>