I had this problem once...

Check if your 16f84 is not set up for any thing else than XT ossilator.
(Mine was set for th RC ossilator and did the same...)

----- Original Message -----
From: Nuri ERGINER <nerginer@SSM.GOV.TR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 23, 2001 9:13 AM
Subject: [PIC]:something unusual


> Hi,
>
> I program and build my first pic16f84a project it is offcourse a flashing
> led.
> What is unusual is the circuit is working when I touched the 4 mhz cristal
> by my hand.
> I connect 3 470 resistor to rb0,rb1,rb2 then I connect 3 led between
> resistors and ground.
> I use 4mhz cristal connected to pic and I use 2 22pf cristal to ground I
> connect the vss and vdd.
>
> Is there any mistake with the circuit?
>
> Regards,
> Nuri Erginer
>
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