#include <avr/io.h>
void TimerInit();
unsigned char periode;
/*
 prescaller 8 , Xtal 16MHz
 tick = 8/16Mhz= 0.5 us
 delay=counter*tick
 delay=counter*0.5us
 counter=delayus/0.5us
 untuk sampling rate 32 khz maka Tsampling= 1/40Khz= 25 us
 counter = 25/0.5 us = 50
 nilai TCNT1= -62,5 -> karena counter up
 */
int main(void) {
    DDRB |= _BV(PB7);
    TimerInit();
    while (1) {
        if (TIFR0&(1<<TOV0)) {
            TCNT0= (unsigned char)-50;
            //clear flag
            TIFR0|=(1<<TOV0);
            PORTB ^= (1 << PB7);
            }
    }
    }
void TimerInit(void) {
TCNT0  = (unsigned char) -50; // reset counter
TCCR0B  = (1 << CS01)  ; //prescaller 8
}