Question

Problem 1 (35 points) Based on the AVR code given below, answer the questions that follows: // Problem 1 #define F_CPU 8000000UL #include <avr/io.h> #include <avr/interrupts.h> int time_entr = 0; int main () { TCCR0=0x03; TCNT0=0x00; DDRB=0xFF; while (1) {}; } ISR (TIMERO_OVF_vect) { TCNT0 = 6; if (time_entr++ == 500) { 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 Timer0? 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. [5 points] [5 points] [10 points] [15 points]

          Problem 1 (35 points)
Based on the AVR code given below, answer the questions that follows:
// Problem 1
#define F_CPU 8000000UL
#include <avr/io.h>
#include <avr/interrupts.h>
int time_entr = 0;
int main ()
{
TCCR0=0x03;
TCNT0=0x00;
DDRB=0xFF;
while (1) {};
}
ISR (TIMERO_OVF_vect)
{
TCNT0 = 6;
if (time_entr++ == 500)
{
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
Timer0?
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.
[5 points]
[5 points]
[10 points]
[15 points]

Problem 1 (35 points)
Based on the AVR code given below, answer the questions that follows:
// Problem 1
#define FCPU 8000000UL
#include <avr/io.h>
#include <avr/interrupts.h>
int timeentr = 0;
int main ()

TCCR0=0x03;
TCNT0=0x00;
DDRB=0xFF;
while (1) ;

ISR (TIMEROOVFvect)

TCNT0 = 6;
if (timeentr++ == 500)

PORTB = PORTB ^ 0x10;
timeentr = 0;

1. What is the prescalar value and, as a result of this value, what clock signal (specify in Hz) gets applied to
Timer0?
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.
[5 points]
[5 points]
[10 points]
[15 points]

Added by Thomas B.

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