Acionando direto

  //-----------------------------
  void setup()
  {
      DDRD =  B11111100;     // sets Arduino pins 1 to 7 as outputs, pin 1 and 0 as input
  }
  //-----------------------------
  void loop()
  {
        PORTD = 0x08;          // Data
      PORTD = 0x04;          // Clock HIGH
      PORTD = 0x00;          // Clock LOW Latch LOW Data LOW

        PORTD = 0x10;          // Latch HIGH
 //       delayMicroseconds(1);

        PORTD = 0x00;          // Data
      PORTD = 0x04;          // Clock HIGH
      PORTD = 0x00;          // Clock LOW Latch LOW Data LOW

        PORTD = 0x10;          // Latch HIGH
//        delayMicroseconds(1);
}