#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
void TimerInit();
unsigned char periode;
ISR (TIMER0_COMPA_vect)
{
PORTB ^= (1 << PB7);
}
/*
prescaller 64 , Xtal 16MHz
 tick = 64/16Mhz= 4 us
 delay=counter*tick
 delay=counter*4us
untuk sampling rate 2 khz maka Tsampling= 1/2Khz= 500us
 counter = 500/4us = 125
nilai TCNT1= -125-> karena counter up
 */
int main(void) {
DDRB |= _BV(PB7);
TimerInit(); /// schedule 10ms
sei();
/// enable global interupsi
while (1) {
sleep_mode(); // sleep
}
}
void TimerInit(void) {
// TCNT0 = -125; // reset counter
TCCR0B = (1 << CS01) | (1<< CS00) ; //prescaller 8
TIMSK0 |= (1 << OCIE0A); // enable compare maatch interrupt
TCCR0A |=_BV(WGM01); //mode Timer CTC
OCR0A = 125;
}