I use external interrupt to measure the frequency of an astable multivibrator (with ne555). Now I'd like to reach, that one of the output of the AVR shows the square wave, what exactly the ne555 make, but with a time delay in function of the frequency. (If the freq for example 600Hz, the output squarewave also 600Hz, but with 10ms delay). I use Attiny2313. Can somebody help me how to start?