#include <avr/io.h>    			
#define serPin 3

int main(void) 
{	
    unsigned char x;
    unsigned char REGA=0;
    
	DDRC &= ~(1<<serPin);	

    for(x=0;x<8;x++)
	{
		REGA = REGA << 1;
    	REGA |= (PINC &(1<<serPin))>> serPin;
	}
    
	PORTD = REGA; 

	return 0;
}