[SOLVED] ATMega8 Frequeny problem and i confused :|

ATMega8 Frequency problem and i confused :|

HELLO. I wrote a code to atmega8 to Clear OC2 pin of avr in frequeny of 8MHZ AND i set cs20 of timer2 in no prescaling (clk of timer==clock of cpu);here is code but when i run this in proteus and use Counter Timer component in proteus to measure Frequency of OC2 PIN IT SHOWS 31.25KHz it means that==>> 8MHz/256=31.25KHz but i chosen Timer1 clocl== F_clock=8MHz:what is problem:: also i set CLCSEL FUSE INTERNAL 8MHz IN PROTEUS:


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#include <avr/io.h>
#include <util/delay.h>

void init_pwm()
{
TCCR2 |= (1<<CS20) | (1<<WGM20) | (1<<WGM21) |(1<<COM21);
TCNT2=0;
OCR2=128; //DutyCycle =50%
DDRB |=(1<<PB3);

}

int main(void)
{

init_pwm();

while(1)
{

}
}

Hi

I'm not sure if understand right..

8MHz without prescaler,
128 clock cycles low, 128 clock cycles high, makes 256 clock cycles for a complete square wave.
Makes 31.25kHz.

Did you expect something else?

Klaus

HI KlausST AND THANKS FOR REPLAY ; i did not understand the consept and that was my error,you helped me to remember that any thik of timer work at cpu clock and ocr2=256 of thiks ,thanks again