#include <avr/io.h>    		

int main(void) 
{	
    unsigned char bcdbyte;
    unsigned char w = '4';
    unsigned char z = '7';
    DDRB = 0xFF ;		
    w = w & 0x0F;		
    w = w << 4;			
    z = z & 0x0F;		
    bcdbyte = w | z;	
    PORTB = bcdbyte;

	return 0;
}