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Microcontrollers Question & Answers

June 5, 2021 By WatElectronics

This article lists 90+ Microcontrollers MCQs for engineering students. All the Microcontrollers Questions & Answers given below include a solution and link wherever possible to the relevant topic.

The microcontrollers used in almost all electronic devices, it is composed of two terms micro and controller, whereas micro means very small in size, and controller means a device that controls the operations of all the devices.

The microcontroller consists of various components like memory, serial input/output ports, peripheral devices, timers, counters, and clock circuits, so the microcontroller is nothing but an on-chip computer where all the devices of the computer are embedded on a single chip.

It can be used as an engine controller in automobiles, they are also used in washing machines, refrigerators, microwave ovens for controlling the temperature in the ovens, etc. The speed of the microcontrollers is relatively slow compared to microprocessors. The microcontrollers are classified into three types based on bits they are 8 bit, 16 bit, and 32-bit microcontrollers.

The 8-bit microcontrollers are used to execute both arithmetic and logical operations, the 8051 and 8031 are examples of 8-bit registers. The microcontrollers are of two types based on instruction set they are Reduced Instruction Set Computer, and Complex Instruction Set Computer.

1). The microcontrollers are used in ____________

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Read more about 8051 Microcontroller
2). The speed of the microcontrollers are ___________

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3). How many of microcontrollers are there based on bits?

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4). The microcontrollers based on memory classified into ______

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5). How many of microcontrollers are there based on instruction set?

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6). The 8-bit microcontrollers are used to execute _________

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7). ____________ is an example of 16 bit microcontroller

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8). The 32 bit microcontroller used in automatically controlled applications like __________

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9). The type of microcontroller is designed in such a way that they don’t have a program memory on the chip is called as __________

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10). _________ is an example of external memory microcontroller

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11). In embedded memory microcontroller has __________

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12). __________ is an example of embedded memory microcontroller

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13). ___________ instruction set allows the user to insert a single instruction as an alternative to many simple instructions

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14). The reduced instruction set computer reduces the operational time by shortening the clock cycle per instruction

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15). _____________ is the first microcontroller designed by intel

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16). The 8051 microcontroller is a __________ bit microcontroller

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17). The microcontroller which will be dealing with 8 bit data that will be called as _________

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18). The microcontrollers are divided into how many categories?

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19). The 8051 microcontroller has______

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20). The 8051 microcontroller has______

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Microcontrollers Quiz Questions and Answers

21). The ALU performs ______________

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22). The accumulator in an 8051 microcontroller is a ________

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23). What is the standard form of PSM?

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24). The stack pointer in 8051 architecture is a ________

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25). The data pointer in an 8051 architecture is a __________

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26). _____________is used as address pointer in order to access the instructions of the program

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27). The microcontroller has only one or two instructions to move data between memory and CPU

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28). How many bit handling instructions does microcontroller have?

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29). The access time for built in memory and input/output devices in microcontroller is ____

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30). The microcontroller requires less hardware devices

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31). In microcontroller power consumption is _______

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32). The 8051 instructions divided into how many categories?

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33). _________ instruction move the contents of a register to accumulator

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34). ________ defines the byte type variable

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35). When define byte assembly directive used to define data the numbers can be in _______

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36). The assembler always converts number (byte) to _______ format

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37). Which assembler directive is used to set the beginning address of the program?

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38). How many bit handling instructions does microprocessor have?

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39). The MOV instruction, push pop instruction, XCHG instruction comes under ___________

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40). In __________ the characters are placed in quotation marks

Add description here!

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Microcontrollers Important Questions and Answers

41). The assembler directive _______ is placed at the end of the source and it acts as the last statement of the program

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42). ________ declare 24 byte stack in data segment that starts at internal RAM location 08H

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43). __________ assembler directive declares the variables defined in a specific file that ca be used in the other source file

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44). ____________ assembler directive declares the variables that are used in the present file but are defined in some other source file

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45). The interrupt service routine always ends with return (RET) instruction, and the execution of the RET instruction results in ____________

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46). The interrupts in 8051 microcontroller are classified into __________

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47). How many external interrupts does 8051 microcontroller have?

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48). If any internal peripheral generating an interrupt request that will be called an _________

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49). If any external peripheral generating an external request that will be called an _________

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50). The interrupts which can be disabled by the microcontroller using some instructions is called as _________

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51). If the address provided by some peripheral devices that type of interrupts are called as __________

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52). In ___________ interrupts the starting address is fixed

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53). How many interrupts are available in 8051 microcontroller?

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54). The 8051 microcontroller has five interrupts and the five interrupts are _________

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55). What are the five interrupts of 8051 microcontroller?

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56). __________ interrupts are the internal interrupts in 8051 microcontroller

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57). The interrupt enable and interrupt priority registers in 8051 microcontroller is a ______

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58). How many oscillator periods defines the machine cycle

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59). How many states does machine cycle consists of ______

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60). In reduced instruction set computer architecture the number of instructions involved is _______

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Microcontrollers Interview Questions and Answers

61). In complex instruction set computer architecture the number of instructions involved is _______

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62). The small computer instructions provide _______ to the processors

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63). The applications of ARM processor are ______

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Read more about ARM Processor
64). The ARM processors are _______

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65). The serial data communication in 8051 microcontroller uses ________

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66). What is the standard form of UART?

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Read more about UART 
67). What is the standard form of USART?

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68). In which duplex the data is transmitted in one way at a time?

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69). In which duplex the data is transmitted in both ways at the same time?

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70). The serial control register (SCON register) operates in how many modes?

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71). The vector address of the timer interrupt 1 is ________

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72). The mode 1 in the serial control register (SCON) is a ______

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73). The mode 2 in the serial control register (SCON) is a ______ with set data rate

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74). The mode 3 in the serial control register (SCON) is a ______

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75). What is the standard of the SBUF register?

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76). The serial buffer register is an ______

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77). How many transistors do small scale integration IC’s require?

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78). How many transistors do medium scale integration IC’s require?

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79). How many transistors do large-scale integration IC’s require?

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80). How many transistors do very large-scale integration IC’s require?

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Microcontrollers Questions and Answers for Engineers

81). Which one is the bit addressable register?

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82). Which of the following is an 8 bit register?

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83). Which register provides the status and control information about the serial port is _________

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84). Which register provides control and status information about counters is ________

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85). The receive buffer of the serial data buffer is a_______

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86). Which register contains the status information?

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87). Which register used as a scratchpad?

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88). Which register used as an operand register?

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89). Which register is used for accessing the external data memory?

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90). The vector address of the external interrupt 0 is ________

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91). The vector address of the external interrupt 1 is ________

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