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NNTP-Posting-Date: Thu, 07 Nov 2002 05:52:13 -0600
Subject: Re: Problems with cristal as clock for atmel AT90S8535
Date: Thu, 7 Nov 2002 06:52:13 -0500
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Expanding on this idea....
Do you have all 3 power pins and all 3 ground pins connected on the Atmel
What state is your reset pin in? It should be pulled high for the time
"madcat" wrote in message
> "Dave VanHorn" wrote in message
> > > At the moment i have a 8 Mhz cristal connected to X1 and X2 and two
> > > capacitors here a little ascii art to make it more clear:
> > You probably need to double up the cap sizes. The caps are in series,
> > the point of view of the crystal.
> serie? are they not paralel
> | |
> -X- (cristal)
> | |
> = = (capacitors)
> | |
> ----------- ground
> > > -----| 22pF
> > > X2 |-------|-------][---|
> > > | cristal 8Mhz |
> > > X1 |-------|-------][---|
> > > -----| 22pF |
> > > GND
> > Does the ground lead go directly, and only, to one of the 8535 ground
> yes ,the same ground that is connected to the ground of the atmel (pin 11)
> > > I used a hosonic 8Mhz b214 in a HC-49/U case.
> > > (it's a cristal in a metal case with two pins)
> > > I can not find any datasheet of it.
> > Not good, but it should still run.
> which cristal should i use?
> an oscilator with 4 pins (5 V,ground, output ) ?
> and connect that one to X1 ?
> > > I tried to measure the cristal via a osciloscope.. but i think the
> > is
> > > to weak to measure.
> > > many schematics i see on internet i see have this construction.
> > Probe the xtal out pin only.
> with a other cristal oscilator?
> but then a DIL version:
> like this
> i use now someting like this:
> > > so i assume the atmel has an amplifier build in for the cristal.
> > > I thougt the two small capacitors were there to make teh cristal
> > > out of it self and it did not need any extra signal to make a signal.
> > They are providing the load capacitance that the crystal needs.
> > > How does a cristal actualy work.. does it just make a sinus wave all
> > > time out of itself?
> > Nope, but at 8 MHz, the phase shift through the crystal, with the right
> > in place, will be 180 degrees.
> so i do not need to have any voltage input for the kristal?
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