Mega88 PWM für LED-ansteuerung

Hi

>CLKPR = (1<<CLKPCE)|(1<<CLKPS1)|(1<<CLKPS0); //8MHz/8 = 1MHz

So funktioniert das nicht:

1. Write the Clock Prescaler Change Enable (CLKPCE) bit to one and all 
other bits in CLKPR to zero.
2. Within four cycles, write the desired value to CLKPS while writing a 
zero to CLKPCE.

MfG Spess

Danke, also sollte es so laufen?
Oder muss ich dazwischen irgendwie warten?

int main(void)
{
    /* insert your hardware initialization here */
    sei();      //enable interrupts
    DDRD = 1<<DDD6;  //PortD6 als Ausgang OC0A für PWM

    CLKPR = 0x80;
    CLKPR = (0<<CLKPCE)|(1<<CLKPS1)|(1<<CLKPS0); //8MHz/8 = 1MHz
    //Clear OC0A on Compare Match, set OC0A at BOTTOM
    //Fast PWM
    TCCR0A = (1<<COM0A1)|(1<<WGM01)|(1<<WGM00);
    TCCR0B = (0<<WGM02)|(1<<CS01);

    for(;;){

        /* insert your main loop code here */
        OCR0A = 0x8F;
    }
    return 0;   /* never reached */
}