tinkercat fast pwm normal mode

toggle clock on timer overflow

int period;

void setup()

{

   TCCR2A = 0x00; // Wave Form Generation Mode 0: Normal Mode; OC2A disconnected

  TCCR2B = (1<<CS22) + (1<<CS21) + (1<<CS20); // prescaler = 1024

  TIMSK2 = (1<<TOIE2); // interrupt when TCNT2 is overflowed

  DDRD |= (1<<PD7);  // Portmanipulation: replaces pinMode(7, OUTPUT);

  Serial.begin(9600);

}

void loop()

{

 

}

ISR(TIMER2_OVF_vect){

    PORTD ^= (1<<PD7); // toggle PD7

  period = TCNT2 *0.0000625*1024;

  Serial.print("Period: ");

  Serial.println(period);

}

reference:

https://wolles-elektronikkiste.de/en/timer-and-pwm-part-1-8-bit-timer0-2

https://docs.arduino.cc/tutorials/generic/secrets-of-arduino-pwm