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AVR Microcontroller Question and Answers

July 4, 2022 By WatElectronics

This article lists 75 AVR Microcontroller MCQs for engineering students. All the AVR Microcontroller Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, or interviews, or professionals who would like to brush up on the fundamentals of AVR Microcontroller.

AVR Microcontroller is designed by Atmel. It comes in different configurations with different designs using surface mount or hole mounting. AVR microcontrollers are available in 8-pin, 16-pin, 32-pin, and 64-pins. Most AVR Microcontrollers used are the ATmega8 microcontroller, ATmega16 microcontroller, ATmega32 microcontroller, and ATmega328 microcontroller.

ATmega32 microcontroller is a low-power CMOS technology-based controller. It is based on RISC architecture and can execute 1 million instructions per cycle with the frequency of 1Mhz produced by a crystal oscillator.

It has 32 I/O programmable lines with 8 channels and 10-bit ADC, two 8-bit timers/counters with Prescaler and compare modes, and one 16-bit timer/counter with capture, Prescaler, and compare modes. Available in 40-pin DIP with 4 PWM channels.

Special features of this MC are interrupting sources and six sleep modes. Two memory spaces: program and data memory are used in addition to EEPROM memory storage with five addressing modes for data memory. It has 1024 bytes of EEPROM with data spaces for reading and writing.

Atmega8 MC has 5 sleep modes, pins 23-28 are used as ADC channels, and three registers are available DDR, PORT, and PIN. In  PWM, the period is the sum of off and on time of the PWM signal and the duty cycle is the percentage of the period when the signal remains ON.

1). AVR is a family of _______ which was developed by Atmel company.

Hint
2). AVR is the first MC to use on-chip ___ memory for program storage?

Hint
3). AVR Microcontroller has a ______ architecture?

Hint
4). AVR is a ____ RISC Single chip microcontroller?

Hint
Read more about RISC and CISC difference.
5). AVR Stands for _______?

Hint
6). AVR core with FPGA can run up to ____ Mhz?

Hint
Read more about FPGA
7). AVR DX family has a ____ bit ADC?

Hint
8). AVR DX family has a ____ bit DAC?

Hint
9). AVR DA series has no _____ high-frequency crystal?

Hint
10). AVR DB series has ____ on chip opamps?

Hint
11). Each GPIO port on mega or tiny AVR drives up to ___ pins?

Hint
Read more about Op-amps.
12) Each GPIO port is controlled by _____ 8-bit registers?

Hint
13). DDRx registers configure the pins as either _____ or outputs?

Hint
14). In DDRx, PORTx, PINx, x represents the port ____?

Hint
15). PORTx sets the output values on ____ configured as outputs?

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16). PORTx enables or disables the ____ resistor on pins configured as inputs?

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17). PINx Input register which reads an ____ signal?

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18). All AVR microcontrollers have internal _____ for semi-data storage?

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19). EEPROM access much ______ than other internal RAM?

Hint
20). ATMega 32 AVR Microcontroller has ___ bytes of internal static RAM?

Hint

AVR Microcontroller MCQs for Interviews

21). ATMega 32 AVR Microcontroller has _____ bytes of EEPROM?

Hint
22). Atmega 32 AVR has one ____ timer/counter with a separate Prescaler?

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23). ____kilo bytes of system self-programmable flash program memory?

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24). _____ Programmable I/O lines in AVR microcontrollers?

Hint
25). PWM Channels that exist in AVR microcontrollers are ___?

Hint
26). How many sleep modes exist in AVR microcontrollers?

Hint
27). ATmega32 microController is a low-power ____ technology based controller?

Hint
28). ATmega 32 microcontroller is a ___ pin DIP?

Hint
29). Port A serves as ___ inputs for A/D Converter?

Hint
30).____ is an analog signal reference pin for the analog to digital converter?

Hint
31).____ acts as input for inverting amplifiers and clock circuits?

Hint
32).____ acts as output from inverting oscillator amplifiers?

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33)._____ is a supply voltage pin connected to A/D Converter?

Hint
34). How many addressing modes exist for data memory?

Hint
35).____ I/O registers are accessible by SRAM memory?

Hint

AVR Microcontroller MCQs for Exams

36). 8KB of flash memory divided into ___ types?

Hint
37). All registers in ATmega8 microcontrollers are connected directly to ____?

Hint
38). PORT D and PORT B have ___ I/O lines?

Hint
39). Port C has ____ I/O lines of ATmega 8 MC?

Hint
40). Using pins 4 and 5 of Atmega 8 MC are used as ____ interrupts?

Hint
41). Pins 12 and 13 are used as analog _____ inputs?

Hint
42). Pins 6 and 11 are used as _____/timer sources?

Hint
43). Pins 23 to 28 are used for ____ channels?

Hint
44). Pin 19 is used as ____ clock input for the SPI channel?

Hint
45). ______ mode is used for saving the operational power of a microcontroller?

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46).______ mode stops the functioning of the CPU?

Hint
47).____ mode stops all the generated clocks?

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48). In ___ mode, only an oscillator is allowed to operate all operations of MC?

Hint
49).DDR Stands for _____?

Hint
50). USART protocol supports the _____ protocol?

Hint
51). AVR USART generates a high _____ baud rate?

Hint
52). AVR USART consists of two ____ bits?

Hint
53). USART protocol of the AVR microcontroller operates in ___ modes?

Hint
54). Data is transmitted and received bit by bit without ____ by the predefined baud rate?

Hint
55). In asynchronous double speed mode, data is transferred at double the ____ rate?

Hint
56). If UMSEL is 0, then the mode is ______?

Hint
57). If UMSEL is 1, then the mode is ______?

Hint
58). Expand PDI stands for ____?

Hint
59). ATmega 16 works on ___ Mhz of maximum frequency?

Hint

AVR Microcontroller MCQs for Quiz

60). ATmega32 controller operates from 1.8 to ___ volts?

Hint
61). JTAG is interfaced for on-chip _____ and programming?

Hint
62). AVR can execute single ___ execution for each second?

Hint
63). If the operating frequency is high then the speed is also ____?

Hint
64). 16 interrupts are ____ in the AVR microcontroller?

Hint
65). Watchdog timer is present with internal ____?

Hint
66). Expand SRAM ______?

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67)._____ is used to connect a network for devices?

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68). Set the SPI to enable bit inside the ___ register?

Hint
69). SPI exchange the contents of SPDR register of master and _____?

Hint
70). In SPCR Prescaler bits are _____ to configure?

Hint
71). For interfacing ADC0804 with any microcontroller, a minimum of ___ pins are required?

Hint
72).____ is a square wave with varying low and high amplitude signals?

Hint
73). _____ represents the percentage of the period when the signal remains ON?

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74). ____ is the sum of on and off-time of pulse width modulation?

Hint
75).____ operation is performed by averaging the PWM signal?

Hint
clock.png

Time is Up!

clock.png

Time's up

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