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Set Timer1 as counter to cont pulse of incoming (frequency to be measured) signal
And set timer2 as 1 sec time base (signal must be with in microcontroller voltage levels)
Reset Timer1(counter) to 0 set it to start count , start timer2 for 1 sec delay
stop timer1(counter) when delay pass and get the counted value from timer register
Do some math (F=1/T) - and you have the measured frequency
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