void setup() {
  Serial.begin(9600);
  pinMode(9, OUTPUT);
  TCCR1A = (TCCR1A & B00111100) | B10000010;   //Phase and frequency correct, Non-inverting mode, TOP defined by ICR1
  TCCR1B = (TCCR1B & B11100000) | B00010001;   //No prescale
  ICR1 = 0xFFFF;
}

void loop() {
  //Increasing pulse
  for(unsigned int i=0;i<65535;i++){
     pwm_16(i);
  }
 //Decreasing pulse
  for(unsigned int j=65535;j!=0;j--){
    pwm_16(j);
  }
}

void pwm_16(int val){
  OCR1A = val;
}