> what is PWM   ???

PWM stands fro Pulse Width Modulation. A PWM output typically generates
continious 'square wave' signal (alternating ones and zero) of steady
srequency and a duty cycle that is controlled by the CPU. It is used for
example as a cheap diginal to analog converter with a simple filtering
circuit that converts the square wave to DC voltage proportional to the
duty cycle of the signal but there are many other applications that use
PWM.

Tal

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads