Arduino Mega enable pin connected to timers

Other Hardware 3rd Party Boards
7

You have to enable the OUTPUT in some register, look in the data sheet.

I only found an example for a different timer/pin

void startTransducer()
{
  TCCR2A = _BV(COM2A0) | _BV(WGM21) | _BV(WGM20);
  TCCR2B = _BV(WGM22) | _BV(CS20);
  OCR2A = B11000111; // 199, so timer2 counts from 0 to 199 (200 cycles at 16 MHz)
}

Setting the COM2Ax bits (Compare Output Mode bits) to 01 sets timer/counter2
to toggle OC2A (i.e., Arduino digital pin 11) from high to low when the counter matches
the 8-bit value stored in OCR2A (Output Compare Register A on Counter/Timer 2).

from:

http://www.fiz-ix.com/2012/01/how-to-configure-arduino-timer-2-registers-to-drive-an-ultrasonic-transducer-with-a-square-wave/