How to set up an external timer interrupt at the highest resolution possible?

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i want measure frequency may have slight fluctuations tracking time intervals between crests of wave.

is idea use external interrupts purpose?
how configure external interrupts. can't find arduino example. prefer use assembly.

is possible use external clock source timers higher microcontroller clock itself? how higher? can overclock timer above 20mhz?
thanks.

quote
how configure external interrupts. can't find arduino example.


is google broken in country ?

http://playground.arduino.cc/code/interrupts

http://makezine.com/2012/01/25/how-to-arduino-interrupts/

http://www.dave-auld.net/?option=com_content&view=article&id=107:arduino-interrupts&catid=53:arduino-input-output-basics&itemid=107

about ten thousand more.


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