#include <avr/io.h>      
  #define serpin 3
  
  int main(void) 
  {  
  
      unsigned char conbyte = 0x44;
      unsigned char regalsb;
      unsigned char x;
      regalsb = conbyte;
      ddrc |= (1<<serpin) ;
  
      for(x=0;x<8;x++)
        {
          if( regalsb & 0x01)
      portc |= (1<<serpin);
      else
      portc &= ~(1<<serpin);
  
          regalsb = regalsb >> 1;
        }
  
    return 0;
  }