> Note: Don't expect too much accuracy out of your=20
> run-of-the-mill crystal based oscillator.
> You will get significant drift over time,=20
> temperature, and I believe supply voltage.

How large drift can I expect to be caused by temperature changes? I left
my clock running last night and it was ahead 1 second after 3 hours and
then stayed behind 4 seconds during next 6 hours. If the room
temperature day/night change caused such a drift, what can you expect
from extreme conditions in a rally car where temperature can change from
-20C in the winter to +60C under the sun in the summer!? I'm starting to
believe that using some kind of temperature controlled osc is a must in
my case...

Tauno

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads