int i=0;

void setup() {
  // put your setup code here, to run once:
  //Tos initialize mode/Direction regester
  volatile char* mode = (char*)0x30;
  *mode = 0xFF; // Initially to as Output
  Serial.begin(9600);
  Serial.println("Welcome to Serial Monitor");
}


void loop() {
  // put your main code here, to run repeatedly:
  //Tos set the A0 pin i.e PortF pin to HIGH
  volatile char* out= (char*)0x31;
  while(1){
  //*out ^= (1<<0);
  *out &= (~(1<<0));
  //*out
  }
}