Microcontroller MCQ Questions: Electronics Engineering

Microcontroller MCQ Questions. 24+ Multiple Choice Questions regarding Microcontrollers in Electronics Engineering.


Microcontroller MCQ Questions



Which bits assist in determining the I2C bit rate during the initialization process of the MSSP module in I2C mode ?? 

c. Both a & b
d. None of the above


What should be the value of SSPM3:SSPM0 bits so that SPI can enter the slave mode by enabling SS pin control ??

a. 0000
b. 0100
c. 0010
d. 0001


Which bit of SSPCON must be necessarily set so as to enable the synchronization of serial port ??

c. CKP


Which among the below stated conditions are selected by the SSPCON & SSPSTAT control bits ??

a. Slave Select mode in slave mode
b. Data input sample phase
c. Clock Rate in master mode
d. All of the above


Which among the below-stated components should be filtered for determining the cut-off frequency corresponding to the PW period of the low-pass filter ??

a. Fundamental FPWM & higher harmonics
b. Resonant FPWM & higher harmonics
c. Slowly Varying DC components
d. Slowly Varying AC components


Microcontroller MCQ Questions


How do the variations in an average value get affected by the PWM period ??

a. Longer the PWM period, faster will be the variation in an average value
b. Shorter the PWM period, faster will be the variation in an average value
c. Shorter the PWM period, slower will be the variation in an average value
d. Longer the PWM period, slower will be the variation in an average value


What would be the resolution value if oscillator and PWM frequencies are 16MHz and 2 MHz respectively ??

a. 2
b. 3
c. 4
d. 8


Why are the pulse width modulated outputs required in most of the applications ??

a. To control the average value of input variables
b. To control the average value of output variables
c. Both a & b
d. None of the above


Where does the comparison level occur for 16-bit contents in the compare mode operation ??

a. Between CCPR1 register & TMR1
b. Between CCPR1 & CCPR2 registers
c. Between CCPR2 register & TMR1
d. Between CCPR2 register & TMR0


Which registers are adopted by CPU and peripheral modules so as to control and handle the operation of devices inhibited in RFS ??

a. General Purpose Register
b. Special Purpose Register
c. Special Function Registers
d. All of the above


Microcontroller MCQ Questions


How many bits are utilized by the instruction of direct addressing mode in order to address the register files in PIC ??

a. 2
b. 5
c. 7
d. 8


When does the special address 004H get automatically loaded into the program counter ??

a. After the execution of RESET action in program counter
b. After the execution of ‘goto Mainline ‘ instruction in the program memory
c. At the occurrence of interrupt into the program counter
d. At the clearance of program counter with no value


What location is attributed to ‘goto Mainline’ instruction in the program memory of PIC 16C61 ??

a. 000H
b. 004H
c. 001H
d. 011H


How many bits are required for addressing 2K & 4K program memories of PIC 16C61 respectively ??

a. 4 & 8 bits
b. 8 & 16 bits
c. 11 & 12 bits
d. 12 & 16 bits


What is the executable frequency range of the High speed (HS) clocking method by using crystal/ ceramic/ resonator or any other external clock source ??

a. 0-4 MHz
b. 5-200 KHz
c. 100kHz- 4 MHZ
d. 4-20 MHz


Microcontroller MCQ Questions


Which significant feature/s of crystal source contribute/s to its maximum predilection and utility as compared to other clock sources ??

a. High accuracy
b. Proficiency in time generation
c. Applicability in real-time operations
d. All of the above


Which form of clocking mechanism is highly efficient and reliable for crystal or ceramic clock sources for operating at the range of 5- 200 kHz in PIC ??

a. RC
b. LP (Low-Power Clocking)
c. XT
d. HS (High Speed)


What output is generated by OSC2 pin in PIC oscillator comprising RC components for synchronizing the peripherals with PIC microcontroller ??

a. (1/2) x frequency of OSC1
b. (1/4) x frequency of OSC1
c. (1/8) x frequency of OSC1
d. (1/16) x frequency of OSC1


What happens when the supply voltage falls below 4V during the power-up timer delay of 72ms in PIC ??

a. CPU resets PIC once again in BOR mode
b. BOR reset mode gets disabled
c. PIC does not remain in BOR mode until the voltage increases irrespective of stability
d. Power-up timer kills 72ms more again


Which crucial feature/function of Brown-Out-Reset (BOR) makes the PIC to be completely unique and distinct from other microcontrollers ??

a. It can reset the PIC automatically in running condition
b. It can reset the PIC even when the supply voltage increases above 4V
c. It can reset the PIC without enabling the power-up timer
d. All of the above


Microcontroller MCQ Questions


Which among the below mentioned PICs do not support the Brown-Out-Reset (BOR) feature ??

a. PIC 16C66
B. PIC 16C74
C. PIC 16C61
D. PIC 16C71

a. A & B
b. C & D
c. A & C
d. B & D


When does it become very essential to use the external RC components for the reset circuits ??

a. Only if initialization is necessary for RAM locations
b. Only if VDD power-up slope is insufficient at a requisite level
c. Only if voltage drop exceeds beyond the limit
d. Only if the current limiting factor increases rapidly


Which program location is allocated to the program counter by the reset function in Power-on-Reset (POR) action modes ??

a. Initial address
b. Middle address
c. Final address
d. At any address reliable for reset operations


What is the purpose of using the start-up timers in an oscillator circuit of PIC ??

a. For ensuring the inception and stabilization of an oscillator in a proper manner
b. For detecting the rise in VDD
c. For enabling or disabling the power-up timers
d. For generating the fixed delay of 72ms on power-up timers


What kind of mode is favorable for MCLR pin for indulging in reset operations ??

a. Normal mode
b. Sleep mode
c. Power-down mode
d. Any flexible mode


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