> >BTW, running those numbers with the *maximum* Rs of Mark's crystal (taken >from the datasheet) and a calculated load capacitance with 33pF caps >(calculated CL = 22pF) yields an estimated maximum drive power of 3.8mW, well >above the datasheet 1mW maximum rating of the crystal. That's the problem, >Euros to donuts. I commonly include a series resistor on the output pin, for adjusting drive level, and checking oscillator margin. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist