Below is a program to blink digital pin 5.[@// Blink_Pin_5// demo for Exclusive ORvoid setup(){DDRD = DDRD | B00100000; // set digital pin five as OUTPUT Serial.begin(9600);}void loop(){PORTD = PORTD & B00100000; // invert bit 5 (digital pin 5)// all others unchanged delay(100); }}@]