[Solved] Maximum frequency of digital signal in Arduino Uno?

koolwithk Asks: Maximum frequency of digital signal in Arduino Uno?
As Arduino Uno has a 16 MHz oscillator but while running program it has less frequency because some of the processing power is used for running the program. I have used the delay(1) but it is giving me around 500 Hz.

My questions:

  1. Is there any way to achieve more than 500 Hz?
  2. What would be the maximum frequency of digital signal for below program?

Code:
void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);          
  digitalWrite(13, LOW);         
}

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