Saif, please, get a pair of pliers and tear the shift key off your keyboard. Your love of capitals makes some of your posts virtually impossible to read.

The circuit Saif present above ( http://www.8052.com/forum/read.phtml?id=124700 ) which, most likely "works" has a few weaknesses: 1) there is no positive feedback i.e. no hysteresis = noise is likely 2) the comparator will be driven so far into saturation that I doubt it will "come out" as fast as is desired.

Erik