> For a 166kHz (square wave osc), I would go for a timer ...
> anyone go for a crystal osc. as possibly a better option?
> {I am new to the field...please comment!}

 It comes down to the same thing. The timer will be based
on the crystal

 166000Hz  ($28870) is  6.0241us per cycle. I've tried a few
 crystals but haven't found a hex or decimal value that is very
helpful. It looks like you'll have to aim for an average of 166kHz
rather than a constant. A 6.666666MHz would solve your
problem

 Perhaps a 12MHz crystal for a 0.33333us instruction cycle
time (18 for 6.000us and 19 for 6.333us). 6.000us = 166.667kHz
 and 6..333us = 157.895kHz. Work out the ratio of these two
to average 166kHz

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