reveiver

#define F_CPU 1000000UL
#include <avr/io.h>
#include <avr/interrupt.h>

int main(void)
{
	DDRB|= (1<<PINB0);
	PORTB|= (1<<PINB0);

	int UBRR_val=25;

	UBRR0H = (unsigned char) (UBRR_val  >> 8);
	UBRR0L = (unsigned char) UBRR_val;
	UCSR0B = (1 << RXEN0) | (1 << TXEN0);
	UCSR0C |= (1 << USBS0) | (3 << UCSZ00);

	unsigned char data;

	while(1)
		{
			while ( !(UCSR0A &(1 <<RXC0)) );

			data = UDR0;

			if (data = 0b11111111)
			{
			PORTB^= (1<<PINB0);
			}

		}

}