Paste code

// this code sets up counter0 for an 8kHz Fast PWM wave @ 16Mhz Clock


#include <avr/io.h>


int main(void)
{
    DDRB |= (1 << DDB3);
    // PD6 is now an output

    OCR0A = 0;
    // set PWM for 50% duty cycle


    TCCR0A |= (1 << COM0A1);
    // set none-inverting mode

    TCCR0A |= (1 << WGM01) | (1 << WGM00);
    // set fast PWM Mode

    TCCR0B |= (1 << CS01);
    // set prescaler to 8 and starts PWM

   //OCR0A = 255; //works!

    while (1);
    {
 OCR0A = 255; //doesnt work!
    }
}