byte counter=0;

void setup() {
  Serial.begin(9600);
}

void loop()
{  
  every();   
  counter++;
}

void every()
{
  static byte lastCount = 0;
     
  if (counter - lastCount == 255U)
  {
    Serial.print(counter);
  Serial.print('\t');
  Serial.println(lastCount);
    //lastCount = counter;
  
    Serial.println("EVENT");
  }


}