This set of Arduino Multiple Choice Questions & Answers (MCQs) focuses on “Microcontroller Specifications – AtMega 32U4”.
1. How much flash memory does the Atmega32U4 have?
a) 13K bytes
b) 16K bytes
c) 256K bytes
d) 32K bytes
View Answer
Explanation: A flash memory is a type of non-volatile memory, which does not get erased when the power supply is cutoff from the chip. The Atmega32U4 has 32K bytes of flash memory.
2. How many timers does the Atmega32U4 have?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: The Atmega32U4 has a total of 4 timers, of which 1 is an 8-bit timer, 2 are 16-bit timers, and 1 is a 10-bit timer. The number of bits here represents the resolution of the timers, I.e. the number of bits each timer can store.
3. How many comparators does the Atmega32U4 have?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: A comparator is basically used for comparing voltages. It takes 2 voltages as input and outputs the higher of the two. The Atmega32U4 has 1 such comparator only.
4. Does the Atmega32U4 have a way to handle the brown-out condition?
a) Yes, it does. It has a provision to programmatically change the brown-out threshold for the chip
b) No, it does not. It does not have a provision to programmatically change the brown-out threshold for the chip
c) Yes, it does. But one cannot change the inbuilt brown-out threshold set for the chip during fabrication
d) Yes, it does. But one can only increase the brown-out threshold for the chip, not decrease it
View Answer
Explanation: The Atmega32U4 has a provision to change the brown-out threshold. A brown-out condition occurs when there is a dip in supply voltage that’s being fed to the chip. If the chip continues to function at that time, then it would lead to wrong calculations being done, and that is harmful especially in applications for different industries. Hence in that condition, the chip resets the operations and starts over.
5. Which Arduino Boards use the Atmega32U4?
a) Arduino Micro
b) Arduino Leonardo
c) Arduino Uno
d) None Mega
View Answer
Explanation: The Arduino Leonardo uses the Atmega32U4. Some other boards that use this microcontroller include the Arduino Pro Micro, which is a smaller development board than the Arduino Leonardo.
6. What is the operating voltage of Atmega32U4?
a) 12V to 9V
b) 1.9V to 5V
c) 1.8V to 5.5V
d) 2.7V to 5.5V
View Answer
Explanation: The operating voltage of the Atmega32U4 is 2.7V to 5.5V. Provide any voltage lower than that and the chip will not function. But however, if any voltage higher than the rated voltage is provided there is a chance of damaging the IC physically. So, under no circumstance should this chip be provided a voltage more than the rated voltage.
7. The Atmega32U4 is an ____________ bit chip.
a) 8
b) 16
c) 32
d) 64
View Answer
Explanation: The Atmega32U4 is capable of processing 8 bits of data at a time and hence it has an 8-bit architecture. Other similar 8-bit processors include the Intel 8080 Processor which ran on a similar 8-bit architecture.
8. Does the Atmega32U4 have an index corner?
a) Yes
b) No
View Answer
Explanation: The Atmega32U4, like most other chips has an index corner which is used to identify the numbering of the pins when reading the pin configuration of the chip. Almost all chips have a similar index corner without which, numbering of the pins would be very difficult.
9. How many General-Purpose Registers are present in the Atmega32U4?
a) 12
b) 64
c) 32
d) 9
View Answer
Explanation: There are 32 General-Purpose Registers in the chip and they are all connected to the ALU (Arithmetic Logical Unit) directly which allow 2 registers to be accessed in one instruction in a clock cycle.
10. The Atmega32U4 is a ________ SC Microcontroller.
a) RI
b) CI
c) AI
d) BI
View Answer
Explanation: The Atmega32U4 is a RISC (Reduced Instruction Set Computer) microcontroller, which allows for a smaller number of cycles per instruction. Thus, making it faster than the CISC (Complex Instruction Set Computer) Architecture.
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