hello karan,
to run servo from avr use its PWM channels… the atmega16/32 has 4 PWM channels so at a time you can use 4 servo motors… there are other ways but i wont gives you perfect results…
atmega64/128 has 6 PWM channels… i will let you know i f come accross any atmega which has more then 6 PWM channels…
al d bst