the internal structure of

[Amit Joshi]

 the internal structure of usart of atmega8535 is quite similar to atmega16 you can prefer the following links:

http://www.engineersgarage.com/embedded/avr-microcontroller-projects/serial-communication-atmega16-usart

http://www.engineersgarage.com/embedded/avr-microcontroller-projects/usart-serial-transmission-circuit

 

then if you face any problem post ur query