#define F_CPU 16e6
#include <avr/io.h>



int main(void) {
    /* Replace with your application code */

	DDRB = (1 << PB1); // PB1/OC1A output pin
	TCCR1A = (0 << COM1A1)|(1 << COM1A0);// Toggle OC1A on compare match
	TCCR1B = (1 << CS12)|(0 << CS11)|(1 << CS10)|(1 << WGM12);// 1024x prescaler and CTC mode with OCR1A top (mode 4)
	OCR1A = 15624;// top value to give 500ms period

	while (1) {
		// Do nothing...
    }
	return (0); // Never reaches this
}