Quote Originally Posted by paul borgmeier View Post
Lastly, you want XTAL caps of 15-33 pF (not 0.20pF or 0.22pF). It should not matter the value as long as you are in the ballpark – they should run your XTAL near the stated tolerance for the XTAL. I cannot image persuading the XTAL to vary by a percent or so day to day as suggested earlier in this thread – maybe I have been lucky the last 10 years, who knows.
Good Luck,
I was throwing out ideas earlier. I've never tried to see how far I could 'pull' a crystal or even if I could do it.
But you're definetly right about reloading the timer. A guy should add a number to the timer rather than reload it with a fixed value in a case like this.

And I think it would really help in this case to see some more code...