Re: [avr-chat] Crystals (was ATmega32 @ 16MHz : fuse bits ??)

[Neil Davey]

Hi,
I'm part of the 'never had a problem with crtsyals' group...
Since your using strip board I'll add the following which I've come 
across a couple of times...
It is possible for the strip tracks to have cracks in them, either from 
manufacture, fatigue or stress, so it might not hurt to run
a line of solder over the unused tracks between the micro and the crystal...

Also, I know it's a simple thing.. but we have all done it... are you 
*sure* your caps are attached to ground.... :)

Regards
Neil

address@hidden wrote:

> On Mon, Nov 14, 2005 at 02:56:41PM +0100, Vincent Trouilliez wrote:
>  
>
> > I use a large strip prototyping board, and add components to it over
> > time as required/needed by the development of the software.
> > I soldered the crystal and capacitors as closely as possible to the AVR
> > chip, 4 tenths of inches from it maximum then.
> >    
>
> Vincent,
>   
> Is there any chance that the tracks have not been cut immediately on the
> other side of the crystal pins? It's worth ensuring the oscillator is
> not loaded by long strip tracks, if another crystal doesn't fix it. 
>
> The only time I've had an AVR not immediately oscillate at 16 MHz, I'd
> forgotten to set CKOPT. Any old crystal out of the junkbox seems to
> work, too, so the road should be smoother once you're over this hump.
>
> Erik
>
>
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>  


--
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Neil Davey
Griffith University

School of Microelectronic Engineering
Nathan Campus
Phone: 07-3735-7008
Fax: 07-3735-5112

School of Psychology - ACNRC
Mt Gravatt Campus
Phone: 07-3735-3395
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