#include <avr/io.h>
#include <stdint.h>

void wacht1sec() {
    uint8_t i;

    TCCR0 &= ~(1<<WGM01 | 1<<WGM00 | 1<<CS01);
    TCCR0 |= 1<<CS02 | 1<<CS00;

    for (i = 0; i < 10; i++) {
        TCNT0 = 0;
        while (TCNT0 != 240);
    }

    TCCR0 &= ~(1<<CS02 | 1<<CS01 | 1<<CS00);
}

int main(void) {
    void wacht1sec();

    wacht1sec();

    while (1);
    return 0;
}