Micro controller based dc motor speed

can u plz explain about MICRO CONTROLLER BASED DC MOTOR SPEED
CONTROL USING PWM TECHNIQUE

Search Microchip's website...There's an application note about it...

Take your CAPS LOCK off when posting...Its bad manners to shout..

thanks for ur help. today only i joint it and i must correct my mistakes(never again post in caps letter)

Here's a quick little explanation of motor speed control. Motor equilibrium speed is based on voltage applied. PWM is used to set the voltage. For example, say you had a small DC motor and if you apply 12V it will spin at 1000 rpm. If you applied 6V it will then spin at about 500 rpm. If you have a 12V power supply (say a car battery) you can use PWM to create an average of 6V, or any other voltage across the motor and make it spin slower.

To create 6V, you would use a 50% duty cycle. To do this you could use a replay to switch power on and off to the motor. Usually this type of PWM is done using a frequency of 20 kHz or higher to keep the noise created above the human audible frequencies.

Which chip, what language?

I need advance one

i used atmel micro controller. i need a chip no.(any other advanced chip than atmel micro controller)