the AVR code given below, answer the questions that follows: // Problem 1 #define F_CPU 8000000UL #include #include int time_cntr = 0; int main() { TCCRO=0x03; TCNTO=0x00: DDRB = 0xFF; while (1): } ISR (TIMERO_OVF_vect) { TCNTO - 6; if (time_cntr+-== 500) { PORTB = PORTB0x10; time_cntr = 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] 2. After how many seconds the Timer O interrupt occurs? Explain your answer. [5 points] 3. What is the frequency of waveform generated at Port B pin 4? Show calculations. [10 points] 4. Achieve the same task (by re-writing the program) by using the polling method. [15 points)