> I still found no result, may be I'm ignoring something in
> configuration bit, please tell what can I do ?
>
> Kashif ali

I'm not sure. My experience is only with F84 and F628 and I
assume the F877 MCLR is also purely hardware, and nothing
you could do in software would make any difference. The only
thing I could suggest is to physically check the components.
Perhaps the current limiting 100R is open or high Z or the
switch is faulty. Perhaps even a broken wire. Possibly a nasty
voltage has got into MCLR and destroyed a gate or two in the
Reset path before the actual uC part of the die

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