Experimenting with high frequency PWM output from an Atmel328P.

gistfile1.txt

// the setup routine runs once when you press reset:
void setup() {                
  pinMode(3, OUTPUT);
  pinMode(11, OUTPUT);
  TCCR2Af = _BV(COM2A0) | _BV(COM2B1) | _BV(WGM21) | _BV(WGM20);
  TCCR2B = _BV(WGM22) | _BV(CS20);
  OCR2A = 1;
  OCR2B = 254;
}

void loop() { 
  // HiZ>f
  // AUX Frequency: 4,005,632 Hz
}