#define F_CPU 20000000
#include <avr/delay.h>
#include <avr/io.h>

uint8_t counter; 

void setup() {
   PORTA.DIRCLR |= PIN7_bm;           //Set PA7 to input
   PORTA.PIN7CTRL |= PORT_PULLUPEN_bm;  //Set pullup resistor on PA7
   PORTA.DIRSET |= PIN6_bm;           //Set PA6 as output
} 

void loop() {
  //check to see if PA7 is pulled low
  if(~PORTA.IN & PIN7_bm){
     //wait until PA7 returns high
     while(~PORTA.IN & PIN7_bm){
      _delay_ms(5);
      counter++;
      if(counter >= 5){
        //set PA6 to LOW
        PORTA.OUT |= PIN6_bm;
        _delay_ms(1000);
        //set PA6 to HIGH
        PORTA.OUT &= ~PIN6_bm;
      }
     }
  }
}