not quite off topic but, 8MHZ XTALS

[Bjorn Julin]

>On Mon, 20 Nov 2000, Paul Maddox wrote:
>
> > Dear all,
> >
> >Im useing an 8Mhz crystal for the first time (rather than 8MHz >>DIL  
>modules) and Ive got a problem. When I meter the frequency I >>get 8MHz
> > (this is from the buffer output to the xtal, so loading is not an
> > issue) but occasionally it drops , stops and then restarts.. power
> > supply is fine...
>
>   Almost sounds like microcontroller is entering a sleep mode.

No,its hardly not sleep mode, are you shure you have checked your
design if it uses a feed back resistor over the crystal/buffer?
Most designs do!

For example most/many MCU's uses a 3,5M -10M ohm resistor
paralell with crystall to enshure crystall oscillation start up.
Allso the capasitors shall not be to large, 29p seams OK.

BJ
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