16F877 elapsed time control

[BerkayT]

euh yeah, but the above will never do something else than reading the ADCs?

What do you want to do exactly?

hmm i want it to read the adc s and there will be a voltage change from 2.5 v to 4.8 V my aim is to measure the time elapsed between 4.8 and 2.5 volts and write it to lcd

thanks alot for helping