60Hz input for timer

[johnnyquest]

Hi,
I wrote a program for a 16F628A that inputs a value selected by a 3x4 keypad and display the value on three seven segment leds with the internal oscillator set @ 4MHz. I have a compare routine that limits the input from 0-256. I have the leds displayed in a loop and an interrupt for keypresses. This is tested and works great. My question is about taking the number value that is less that d'256' that is saved in a variable and using a 60Hz AC clock and putting the output on a pin for that many cycles when a button is pressed. Which timer input could I use? I am somewhat confused on how to do this, I have looked at Microchip appnote but there is no code to follow as an example.

This is an example of what I would like to do. I input the number 160 I would like to press a button and get 160 line pulses out.

I have extensivly searched the web to no avail. Any guidance or direction would be most appreciated.

Many Thanks,
JohnnyQuest

 

[akg]

so if u set the value as 120 , then the micro should a pin 120 times in 1(2??) sec(60Hz sync) right??
full wave rectify the 60hz wave , so u get a +ve going 120Hz wave, and give it as i/p to schmitt triggred i/p of micro.. so it becomes a pulse. use a counter variable(set to value X (160 as u said)) , and toggle an o/p pin according to the pulse

HTH