Que: 71. Which of the following will generate the maximum time delay?
|
| a. f/2 |
| b. f/4 |
| c. f/16 |
| d. f/32 |
Que: 72. 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. here the contents are compared with the OCR register, if value becomes equal then only the timer is cleared |
| d. none of the mentioned |
(c). here the contents are compared with the OCR register, if value becomes equal then only the timer is cleared
Que: 73. 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 |
Que: 74. Which pin is used for the input clock of the counter0?
|
| a. PORTB.0 |
| b. PORTB.1 |
| c. PORTB.2 |
| d. PORTB.3 |
Que: 75. 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 |
(b). external clock of the AVR
Que: 76. On reset, what are the contents of the SREG register?
|
| a. 00h |
| b. ffh |
| c. 1fh |
| d. 11h |
Que: 77. TIMSK register is used for?
|
| a. knowing the status of the timer count |
| b. used for masking the interrupts flags of the Timer0, Timer1 and Timer2 |
| c. it is used for enabling all the timer interrupts |
| d. it is used for resetting the value of the interrupts |
(b). used for masking the interrupts flags of the Timer0, Timer1 and Timer2
Que: 78. Why RETI instruction is used after an ISR?
|
| a. because it returns with carry |
| b. because it returns to the main program with all the flags of the SREG raised |
| c. because it returns to the main program after clearing the roll over flag of the interrupt, so that the interrupt can be caused again |
| d. none of the mentioned |
(c). because it returns to the main program after clearing the roll over flag of the interrupt, so that the interrupt can be caused again
Que: 79. In AVR what is the ISR address for an external hardware interrupt?
|
| a. 0002h |
| b. 0004h |
| c. 0006h |
| d. all of the mentioned |
(d). all of the mentioned
Que: 80. What is the address in the interrupt service routine assigned for the timer0 overflow flag?
|
| a. 0012h |
| b. 000Ah |
| c. 0016h |
| d. all of the mentioned |