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SIGNAL(SIG_INTERRUPT0){        PORTD |= (1 << PD6);}int main(void){        //set GLOBAL interrupt enable        GICR=0xC0;        MCUCR=0x0F;        sei();        PORTD |= (1 << PD2);        DDRD |= (1 << PD6);        //SET OUTPUT PINS        //      DDRA |= (0 << PA0);        //DDRD = 0x78;        while (1) {        }        return 0;}