Arduino timer interrupt

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hello,
i bit new programing arduino, trying write timer starts counting @ rising edge of signal (from 1 of analog pins) , stop , store value somewhere whenever sees next rising edge. want find period of input signal precise possible. perhaps using timer 1 prescale of 1 should ?!
i appreciate if guide me on this.
best regards,

this might interesting: http://forum.arduino.cc/index.php/topic,17450.0.html or http://forum.arduino.cc/index.php?topic=171226.msg1276330#new


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