#include <avr/interrupt.h>
void setup(){
  cli();
  DDRD = DDRD | B11111100;
  PORTD = PORTD & B00000011;
  PCICR |= B00000001;
  PCMSK0 |= B00011100;
  sei();
}
void loop(){
 
}
ISR(PCINT0_vect){
  if ((PINB & 1<<2) and (~PINB & 1<<3) and (~PINB & 1<<4)){  //100
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else if ((PINB & 1<<2) and (PINB & 1<<3) and (~PINB & 1<<4)){  //110
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else if ((~PINB & 1<<2) and (PINB & 1<<3) and (~PINB & 1<<4)){  //010
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else if ((~PINB & 1<<2) and (PINB & 1<<3) and (PINB & 1<<4)){  //011
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else if ((~PINB & 1<<2) and (~PINB & 1<<3) and (PINB & 1<<4)){  //001
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else if ((PINB & 1<<2) and (~PINB & 1<<3) and (PINB & 1<<4)){  //101
    PORTD = PORTD & B00000011;
    PORTD = PORTD | Bxxxxxx00;
  }
  else{
    PORTD = PORTD & B00000011; //err
  }
}