void setup() {
DDRD |= (1 << PD7);
cli();
TCCR2A = 0;
TCCR2B = 0;
TCCR2B |= (1 << CS22) + (0 << CS21) + (0 << CS20);
TIMSK2 |= (1 << TOIE1);
TCNT2 = 6;
sei();
Serial.begin(9600);
}
ISR (TIMER2_OVF_vect) {
TCNT2 = 6;
static int stevec = 0;
stevec++;
if (stevec >= 1000) {
stevec = 0;
PORTD ^= (1 << PD7);
}
Serial.println(stevec);
}
void loop() {
}