AVR Direct Port Addressing

gistfile1.ino

//avr direct port addressing

void setup(){
  DDRD = B10000000; //digital 7-0   //7 is output here
  DDRB = B00010000; //digital 15-8  //12 is output here
}

void loop(){
   PORTD = B10000000;   //7 high
   PORTB = B00000000;   //all low
   delay(100);
   PORTD = B00000000;   //all low
   PORTB = B00010000;   //12 high
   delay(100);
}