AVR-Chat

crystals w/ caps are wired exactly the same as the resonator w/  
capacitors, but the fuse settings will probably be different (ie:  
Settling time and low/high voltage).
The base documentation is pretty good about describing it.   There is  
also an app. note on the atmel website about oscillator selection if  
you want to get down into the finer details.

Selecting an 18pf crystal is a good choice.   I made a mistake of 1st  
picking one surplus that needed too much loading and I couldn't find  
caps in that picofarad range that would match up.

hope that helped...

Eric Linn Rabinowitz
N6LG







On Oct 22, 2008, at 6:45 PM, Brian wrote:

I was looking at Jameco for crystals. Under impedance is says 18pf and
series. What is the difference on how they are hooked up to a uC?

Brian