>Like I said, I'm sure I can find a way around this, the math to do 
>1/period is certainly one way. Or a lookup table, or changing it to 
>count pulses over a timer interrupt. All of which have various 
>drawbacks, I was realy just polling for other peoples ideas.

Switch the roles of the two couters/timers. One timer should measure 
(overflow) at regular intervals - 1 sec or other suitable period. The 
measured signal should be counted by the other counter. Then read the 
counter each second, subtract current and previous value and this is 
your frequency. Alternatively clear the counter each second after 
reading the frequency.

Josef


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