Microcontroller Mock Test 5

10%

Question 1 of 10

1. If the pins of the keyboard are used as an interrupt, then these pins will cause an interrupt of what type?

Timer interrupt

TI/RI interrupt

External hardware interrupt

None of the mentioned

Question 1 of 10

Question 2 of 10

2. What does RI handshaking signal refer to according to the RS232 logic?

this pin is high during transmission

none of the mentioned

if this logic is high then a receive interrupt is generated

this pin is high during a reception in order to tell that the device is busy at this particular time

Question 2 of 10

Question 3 of 10

3. Which of the following commands takes more than 100 microseconds to run?

clear screen

shift cursor right

set address location of the DDRAM

shift cursor left

Question 3 of 10

Question 4 of 10

4. In AVR what is the ISR address for an external hardware interrupt?

0006h

0002h

0004h

all of the mentioned

Question 4 of 10

Question 5 of 10

5. What is the use of the PE and the FE bits of the UCSRA register?

they are used to keep the transmission error free

they are used for keeping a check at the data bits to be transferred

they are used for keeping a check at the speed of transmission and reception

they are used as extra redundant bits with no use

Question 5 of 10

Question 6 of 10

6. For selecting the data pins in an LCD, RS pin should be

Question 6 of 10

Question 7 of 10

7. Which register is responsible for handling all the external hardware interrupts?

GICR

TIMSK

IVCE

MCUCR

Question 7 of 10

Question 8 of 10

8. Why RETI instruction be the last instruction of ISR?

because it returns to the main program with all the flags of the SREG raised

because it returns to the main program where interrupt is generated and set the global interrupt enable bit in SREG

none of the mentioned

because it returns with carry

Question 8 of 10

Question 9 of 10

9. With fosc=8 MHz, what will the count that has to filled in the UBRR register to account for the 9600 baud rate?

67H

33H

CEH

34H

Question 9 of 10

Question 10 of 10

10. Which of the following parameters should the transmitter and the receiver agree upon before starting a serial transmission?

baud rate

stop bit

all of the mentioned

frame size

Question 10 of 10