Based on the AVR code given below, answer the questions that follows: // Problem 1 #define F_CPU 8000000UL #include #include int time_entr=0; int main() 1 ISR 1 TCCRO 0x03; TCNTO 0x00; DDRB=0xFF; while (1)); (TIMERO_OVF_vect) TCNTO= 6; if (time_entr++ 500) 1 } PORTB=PORTB^0x10; time_entr = 0; 1. What is the prescalar value and, as a result of this value, what clock signal (specify in Hz) gets applied to Timero? [5 points] [5 points] [10 points] [15 points] 2. After how many seconds the Timer 0 interrupt occurs? Explain your answer. 3. What is the frequency of waveform generated at Port B pin 4? Show calculations. 4. Achieve the same task (by re-writing the program) by using the polling method.