Have you tried something like a 10k resistor between /MCLR and VCC?  If
your value for this resistor (and I think you're supposed to have one
rather than tying it directly to VCC) is too high, this effect sometimes
appears.  Also, check you have tied unused inputs to GND or VCC via similar
value resistors - don't leave them floating, as per the "gotchas" page on
piclist.com.  (#9 on http://piclist.com/techref/piclist/begin.htm).

Cheers,
-Dave.




                    Augusto de Conto
                    <augusto@AUTOMAC       To:     PICLIST@MITVMA.MIT.EDU
                    AO.ENG.BR>             cc:
                    Sent by: pic           Subject:     [PIC] Ghost in my PIC
                    microcontroller
                    discussion list
                    <PICLIST@MITVMA.
                    MIT.EDU>


                    12/18/01 12:24
                    PM
                    Please respond
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Hello All

I have a very strange thing happending with my PIC.
I mounted it in a proto-board and recorded a simple programa.
At first it doesn't work.
Waiting aprox. 1 minute, it beguins to work (sometimes).
Sometimes, when I touch GND, it works again. Sometimes, not.
It works when it wants...
(I'm using a PIC 16F876-04 with a 4MHz XTAL and two 15pF
capacitor)
What can it be? How do I fix it? HELP!

Thank

Augusto de Conto
augusto@automacao.eng.br

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