> A1 as a digital i/p should be very high impedance
But its an analog input. And I just tried the resistor anyway. The 
square wave remains as such. But changes shape with the PIC.

Mohit.

Jinx wrote:
>>> What happens if you try a resistance in place of the PIC pin ?
>> You mean: R4 and then the PIC pin?.. I've tried 10R and
>> 22R. No help
> 
> No, I mean a resistor to ground from the C8 side of R4, without
> the PIC installed. A1 as a digital i/p should be very high impedance
> (judging by the i/p leakage figure of 1uA) so I guess a few Mohm
> might be representative
> 
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