Microcontrollers and Applications Short Questions and Answers | Microcontrollers and Applications Quiz

41 What is the required baud rate for an efficient operation of serial port devices in 8051 microcontroller?

A 1200

B 2400

C 4800

D 9600

Answer: 9600

42 Which port does not represent quasi-bidirectional nature of I/O ports in accordance to the pin configuration of 8051 microcontroller?

A Port 0 (Pins 32-39)

B Port 1 (Pins 1-8)

C Port 2 (Pins 21-28)

D Port 3 (Pins 10-17)

View Answer

Answer: Port 0 (Pins 32-39)

43 Where should the pin 19 (XTAL1), acting as an input of inverting amplifier as well as part of an oscillator circuit, be connected under the application of external clock?

A to XTAL2

B to Vcc

C to GND

D to ALE

View Answer

Answer: to GND

44 Which mode of timer 2 allow to hold the reload values with an assistance of RCAP2H & RCAP2L register pair?

A 8 bit auto-reload mode

B 16 bit auto reload mode

C 8 bit capture mode

D 16 bit capture mode

View Answer

Answer: 16 bit auto reload mode

45 Which registers are supposed to get copied into RCAP2H & RCAP2L respectively due to the transition at 8052 T2EX pin in the capture mode operation?

A TH0 & TH1

B TH1 & TH1

C TH2 & TH2

D All of the above

View Answer

Answer: TH2 & TH2

46 Which timer is attributed to the register pair of RCAP2H & RCAP2L for capture mode operation?

A Timer 0

B Timer 1

C Timer 2

D Timer 3

View Answer

Answer: Timer 2

47 Which among the below stated registers does not belong to the category of special function registers?

A TCON & TMOD

B TH0 & TL0

C P0 & P1

D SP & PC

View Answer

Answer: SP & PC

48 What is the maximum capability of addressing the off-chip data memory & off-chip program memory in a data pointer?

A 8K

B 16K

C 32K

D 64K

View Answer

Answer: 64K

49 Which instruction find its utility in loading the data pointer with 16 bits immediate data?

A MOV

B INC

C DEC

D ADDC

View Answer

Answer: MOV

50 Which commands are used for addressing the off-chip data and associated codes respectively by data pointer?

A MOVX & MOVC

B MOVY & MOVB

C MOVZ & MOVA

D MOVC & MOVY

View Answer

Answer: MOVX & MOVC

51 Which locations of 128 bytes on-chip additional RAM are generally reserved for special functions?

A 80H to 0FFH

B 70H to 0FFH

C 90H to 0FFH

D 60H to 0FFH

View Answer

Answer: 80H to 0FFH

52 It is possible to set the auxiliary carry flag while performing addition or subtraction operations only when the carry exceeds _______

A 1st bit

B 2nd bit

C 3rd bit

D 4th bit

View Answer

Answer: 3rd bit

53 Which register bank is supposed to get selected if the values of register bank select bits RS1 & Rs0 are detected to be ‘1’ & ‘0’ respectively?

A Bank 0

B Bank 1

C Bank 2

D Bank 3

View Answer

Answer: Bank 2

54 Which flags represent the least significant bit (LSB) and most significant bit (MSB) of Program Status Word (PSW) respectively?

A Parity Flag & Carry Flag

B Parity Flag & Auxiliary Carry Flag

C Carry Flag & Overflow Flag

D Carry Flag & Auxiliary Carry Flag

View Answer

Answer: Parity Flag & Carry Flag

55 Which bit/s play/s a significant role in the selection of a bank register of Program Status Word (PSW)?

A RS1

B RS0

C Both a & b

D None of the above

View Answer

Answer: Both a & b

56 What is the default value of stack once after the system undergoes the reset condition?

A 07H

B 08H

C 09H

D 00H

View Answer

Answer: 07H

57 Which among the below mentioned functions does not belong to the category of alternate functions usually performed by Port 3 (Pins 10-17)?

A External Interrupts

B Internal Interrupts

C Serial Ports

D Read / Write Control signals

View Answer

Answer: Internal Interrupts

58 What is the constant activation rate of ALE that is optimized periodically in terms of an oscillator frequency?

A 1 / 8

B 1 / 6

C 1 / 4

D 1 / 2

View Answer

Answer: 1 / 6

59 Which output control signal is activated after every six oscillator periods while fetching the external program memory and almost remains high during internal program execution?

A ALE

B PSEN

C EA

D All of the above

View Answer