>  http://www.fairchildsemi.com/an/AN/AN-340.pdf

Despite their attempts, I'm afraid it's still all a bit of a black
art. The drivers in micros must be more complex than these
parallel circuits, the type I've found so flakey. Do micros have
AGC or some detector in them so they will operate over a
wide range of frequencies ? For example, what is switched
in/out when the micro is set to LP, XT or HS ?

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