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Table of Contents

Arduino Timer Setting

Arduino Uno

 TCCR0B = TCCR0B & 0b11111000 | 0x01; // sets the speed on pin 5 and 6

Set PWM frequency for D5 & D6

TCCR0B = TCCR0B & B11111000 | B00000001; set timer 0 divisor to 1 for PWM frequency of 62500.00 Hz 

 //TCCR0B = TCCR0B & B11111000 | B00000010;    // set timer 0 divisor to     8 for PWM frequency of  7812.50 Hz
 //TCCR0B = TCCR0B & B11111000 | B00000011;    // set timer 0 divisor to    64 for PWM frequency of   976.56 Hz (The DEFAULT)

TCCR0B = TCCR0B & B11111000 | B00000100; set timer 0 divisor to 256 for PWM frequency of 244.14 Hz TCCR0B = TCCR0B & B11111000 | B00000101; set timer 0 divisor to 1024 for PWM frequency of 61.04 Hz

———————————————- Set PWM frequency for D9 & D10 —————————— TCCR1B = TCCR1B & B11111000 | B00000001; set timer 1 divisor to 1 for PWM frequency of 31372.55 Hz TCCR1B = TCCR1B & B11111000 | B00000010; set timer 1 divisor to 8 for PWM frequency of 3921.16 Hz TCCR1B = TCCR1B & B11111000 | B00000011; set timer 1 divisor to 64 for PWM frequency of 490.20 Hz (The DEFAULT) TCCR1B = TCCR1B & B11111000 | B00000100; set timer 1 divisor to 256 for PWM frequency of 122.55 Hz TCCR1B = TCCR1B & B11111000 | B00000101; set timer 1 divisor to 1024 for PWM frequency of 30.64 Hz

———————————————- Set PWM frequency for D3 & D11 —————————— TCCR2B = TCCR2B & B11111000 | B00000001; set timer 2 divisor to 1 for PWM frequency of 31372.55 Hz TCCR2B = TCCR2B & B11111000 | B00000010; set timer 2 divisor to 8 for PWM frequency of 3921.16 Hz TCCR2B = TCCR2B & B11111000 | B00000011; set timer 2 divisor to 32 for PWM frequency of 980.39 Hz TCCR2B = TCCR2B & B11111000 | B00000100; set timer 2 divisor to 64 for PWM frequency of 490.20 Hz (The DEFAULT) TCCR2B = TCCR2B & B11111000 | B00000101; set timer 2 divisor to 128 for PWM frequency of 245.10 Hz TCCR2B = TCCR2B & B11111000 | B00000110; set timer 2 divisor to 256 for PWM frequency of 122.55 Hz TCCR2B = TCCR2B & B11111000 | B00000111; set timer 2 divisor to 1024 for PWM frequency of 30.64 Hz

Arduino Leonardo

Set PWM frequency for D5 & D6

 TCCR0B = TCCR0B & B11111000 | B00000001;    // set timer 0 divisor to     1 for PWM frequency of 62500.00 Hz
 TCCR0B = TCCR0B & B11111000 | B00000010;    // set timer 0 divisor to     8 for PWM frequency of  7812.50 Hz
 TCCR0B = TCCR0B & B11111000 | B00000011;    // set timer 0 divisor to    64 for PWM frequency of   976.56 Hz (The DEFAULT)
 TCCR0B = TCCR0B & B11111000 | B00000100;    // set timer 0 divisor to   256 for PWM frequency of   244.14 Hz
 TCCR0B = TCCR0B & B11111000 | B00000101;    // set timer 0 divisor to  1024 for PWM frequency of    61.04 Hz

Set PWM frequency for D9 & D10

 TCCR1B = TCCR1B & B11111000 | B00000001;    // set timer 1 divisor to     1 for PWM frequency of 31372.55 Hz
 TCCR1B = TCCR1B & B11111000 | B00000010;    // set timer 1 divisor to     8 for PWM frequency of  3921.16 Hz
 TCCR1B = TCCR1B & B11111000 | B00000011;    // set timer 1 divisor to    64 for PWM frequency of   490.20 Hz (The DEFAULT)
 TCCR1B = TCCR1B & B11111000 | B00000100;    // set timer 1 divisor to   256 for PWM frequency of   122.55 Hz
 TCCR1B = TCCR1B & B11111000 | B00000101;    // set timer 1 divisor to  1024 for PWM frequency of    30.64 Hz

Set PWM frequency for D3 & D11

 TCCR2B = TCCR2B & B11111000 | B00000001;    // set timer 2 divisor to     1 for PWM frequency of 31372.55 Hz
 TCCR2B = TCCR2B & B11111000 | B00000010;    // set timer 2 divisor to     8 for PWM frequency of  3921.16 Hz
 TCCR2B = TCCR2B & B11111000 | B00000011;    // set timer 2 divisor to    32 for PWM frequency of   980.39 Hz
 TCCR2B = TCCR2B & B11111000 | B00000100;    // set timer 2 divisor to    64 for PWM frequency of   490.20 Hz (The DEFAULT)
 TCCR2B = TCCR2B & B11111000 | B00000101;    // set timer 2 divisor to   128 for PWM frequency of   245.10 Hz
 TCCR2B = TCCR2B & B11111000 | B00000110;    // set timer 2 divisor to   256 for PWM frequency of   122.55 Hz
 TCCR2B = TCCR2B & B11111000 | B00000111;    // set timer 2 divisor to  1024 for PWM frequency of    30.64 Hz

from https://forum.arduino.cc/index.php?topic=328714.0

One can find a detailed explanation here:
Fast PWM on Arduino Leonardo