1. In AVR, which of the following registers are not used for programming timers?
a) TCNT
b) TCON
c) TIFR
d) None of the mentioned
Answer
Answer: b [Reason:] In the timer programming of an AVR micro controller,mainly used registers are TCNTn that stores the values of the count. TCCRn that is used to assign the mode of operation of a timer and TIFR that stores the status of various flags of the timers. Two more registers are used they are OCRn and OCFn. They are used for comparison with the count register.
2. What is the use of the prescalar in the operation of the timer?
a) for fast calculations
b) for increasing the time delay given by the timer by decreasing its frequency of operation
c) for removing the concept the reloading of count
d) for easy counter operations
Answer
Answer: b [Reason:] Prescalars are used in the operation of the timers because they generally increase the time delay generation by deceasing the frequency of its operation.
3. What modes are generally used in the operation of the timer0?
a) Normal mode
b) CTC mode
c) PWM mode
d) All of the mentioned
Answer
Answer: d [Reason:] Modes of a timer are decided by the WGM00 and WGM01 bit of the TCCR0 register and for timer0 these modes are normal mode, CTC mode, pwm mode and the fast pwm mode.
4. Timer 0 can act as a counter
a) if the CS02-CS00 are 110 or 111
b) if the FOC0 bit is set to 110
c) none of the mentioned
d) all of the mentioned
Answer
Answer: a [Reason:] Timer0 can act as a counter if the CS02-CS00 bits are from 110-111.
5. Which of the timer can operate in the 16 bit condition?
a) timer0
b) timer1
c) timer2
d) all of the mentioned
Answer
Answer: b [Reason:] Timer0 and Timer2 can operate in the 8 bit condition while only Timer 1 operates in the 16 bit condition.
6. Which of the following will generate the maximum time delay?
a) f/2
b) f/4
c) f/16
d) f/32
Answer
Answer: d [Reason:] f/32 has the lowest frequency as it is divided by the maximum value of the constant, so as time and frequency are inversely related to each other so this will generate the maximum amount of machine cycle which will as a result generate the greatest delay.
7. What is the difference in operation of a normal and a CTC mode of a timer?
a) in CTC mode PWM is used
b) here serial timer is monitored
c) her the contents are compared with the OCR register, if value becomes equal then only the timer is cleared
d) none of the mentioned
Answer
Answer: c [Reason:] In CTC mode of a timer the contents of the counter register are compared with the OCR register to clear the flag for the roll over condition to come.
8. We can count the pulses on the positive or the negative edge triggered pulse of the clock?
a) true
b) false
c) can’t be determined
d) depends on the circumstances
Answer
Answer: a [Reason:] A counter can count pulses on the positive or the negative edge of the clock.
9. Which pin is used for the input clock of the counter0?
a) PORTB.0
b) PORTB.1
c) PORTB.2
d) PORTB.3
Answer
Answer: a [Reason:] PORTB.0 is used for the input clock of the counter0 in AVR micro controllers.
10. Which resource provides clock pulse to AVR timers if CS02-00=6?
a) internal clock of the AVR
b) external clock of the AVR
c) none of the mentioned
d) all of the mentioned
Answer
Answer: b [Reason:] External clock is used for providing the pulse to the AVR timers if CS02-00=6.
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