a very simple way to test for oscillation ont he xtal pin is to use a
logic probe.

-Dave





Kieran Miller <kieran@MAC.COM> on 04/11/2000 02:44:01 PM

Please respond to pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>

To:   PICLIST@MITVMA.MIT.EDU
cc:    (bcc: David E Arnold/SYBASE)
Subject:  Re: 16F874 PIC Refuses to Start Up?




> The first thing you MUST establish is if the xtal is
> oscillating.

Yeah - thought so.. :)

I've borrowed a scope, and I have a 16MHz oscillator I'll try if the crystal
isn't oscillating.

How difficult is it to get crystals going generally? What can be wrong,
apart from a duff crystal?


> If a scope is not handy then you could try a simple signal
> detector connected to a voltmeter.

Thanks - useful for future reference!

Kieran