Answer the questions based on the code below

#include

#include

#include

#define F_CPU 4000000

void DelayTimer0 (void)

{

TCNT0 = 0x3C;

TCCR0 = 0b00000101;

while ((TIFR & (1

TCCR0 = 0;

TIFR = (1

}

void delay100ms (void)

{

unsigned int i;

for (i=0; i

}

ISR (INT1_vect)

{

uint8_t b[ ] = {0x18, 0x24, 0x42, 0x81, 0x42, 0x24, 0x18, 0};

for (uint8_t i=0; i

{

PORTC = b[i];

DelayTimer0();

}

}

int main(void)

{

DDRC = 0xFF;

DDRA = 0xFF;

DDRD = 0b11110111;

PORTD = 0b00001000;

GICR = 0x80;

MCUCR = 0x08;

sei ();

while(1)

{

uint8_t mynum[ ] = {0x6D, 0x76, 0x79, 0x79, 0x4F, 0x07, 0x4F, 0x5B};

for (uint8_t i=0; i

{

PORTC = 0;

PORTA = mynum[i];

DelayTimer0();

}

}

}

3. List down directive or file that are required in interrupt programming. 4. Determine the code in program "Lab3Exp1.c" that is use to enable interrupt program