Supports alternativ PWM frequencies for MEGA2560
Attention! Timer0 is also used for other tasks (millis, micros, delay).
Timer0 = D4 and D13
Timer1 = D11, D12
Timer2 = D9, D10
Timer3 = D2, D3, D5
Timer4 = D6, D7, D8
Timer5 = D44, D45, D46
Prescaler 1= 31372,55Hz, 2= 3921,16Hz, 3= 490Hz, 4= 122.55Hz 5= 30Hz (in case of timer0 the PWM frequency for prescaler values 1-5 are doubled)