#include <avr/io.h>

void setup() {
   PORTA.DIRSET = 0b01000000;
   PORTA.DIRCLR = 0b10000000;
}

void loop() {
  bool state = PORTA.IN & 0b10000000; // read the state of a pin
  switch(state)
  {
    case 0:
    PORTA.OUT = 0b00000000;
    break;
    case 1:
    PORTA.OUT = 0b01000000;
    break;
    default:
    PORTA.OUT = 0b00000000;
    break;    
  }
}