set AVR BAUD rate

//#define  F_CPU 1000000UL
#define F_CPU 8000000UL

#define BAUD 9600                        // define baud
#define BAUDRATE ((F_CPU)/(BAUD*16UL)-1) // set baud rate value for UBRR


//Usage snippet
UBRR0H = (BAUDRATE>>8);                      // shift the register right by 8 bits
UBRR0L = BAUDRATE; // set baud rate