HI ALL

I am a student,need details about working principles of AVR
details about advantages and disadvantages of AVR.SCOPE
of AVR in future.AVR Circuit diagram

 

All out there on the web.

 

It is a capable family of single chip processors.
It has a Harvard Architecture, with different address spaces for instructions and data
There are a large number of on-board peripherals
Website is:
www.atmel.com
Click on "products" then click on datasheets.
Like the man said it's all there for the picking.