piclist 2001\01\23\093124a >
Thread: something unusual
face picon face BY : Olin Lathrop email (remove spam text)

> 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.

It's not unusual at all.  Well designed crystal circuits shouldn't be
that sensitive to someone touching the crystal can, especially at the
relatively low frequency of 4MHz.

> 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?

You haven't described any problem with its operation, so apparently not.

Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, KILLspamolin@spam@spamembedinc.com, http://www.embedinc.com

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