too bad PIC16F84a don't have 2 timers... The Henrik solution will work indeed, but i'll suggest to use shorter PAUSEUS, let's say 10uSec... OR a loop of @ nop.

If you need accuracy, you may decide to fine-tune it using MPLAB stopwatch OR measure it using an extra i/o and a scope.

Another solution... Use 2 variables, flags and 1 Timer.

There's many different ways.