PWM - ARM using LED

//you can see the blue LED lights in different intensity
// maximum pwm value 255
void setup()
{
  pinMode(PF_2, OUTPUT);
}
void loop()
{
  analogWrite(PF_2, 50);  
  delay(500);
  analogWrite(PF_2, 100);  
  delay(500);    
  analogWrite(PF_2, 150);  
  delay(500);    
  analogWrite(PF_2, 200);  
  delay(500);  
  analogWrite(PF_2, 255);  
  delay(500);    
}