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UART Question & Answers

July 26, 2021 By WatElectronics

This article lists 100 UART MCQs for engineering students. All the UART Questions & Answers given below includes solution and link wherever possible to the relevant topic.

A UART stands for Universal Asynchronous Receiver Transmitter. As the name suggests, it is an asynchronous type of communication protocol. When two devices need to communicate with each other, there need to be at least two connections between them, one is a transmission line and another one is a reception line for each device.

A UART uses two wires between transmitter and receiver, and the UART frame consists of data, start/stop, and parity bits. The control, status, transmit, and receive registers are the UART registers. The control register contains settings for the UART, and the status register contains information about the UART state or condition.

The Transmit Data Register Empty is a type of UART flag and the Serial Communication Status Register is a type of UART register. The UART is a widely used method, it uses only two wires, whereas the clock signal is not necessary. The disadvantages of a UART are it doesn’t support multiple slaves, and the data frame size is limited to a 9 bits max.

In UART the data is transmitted in the form of bytes, its maximum speed is 115.2Kbps, and its data rate is 20Kbps. The transmitter section of a UART consists of a transmitter shift register and transmitter hold register. The Bluetooth modules, GPS units, microcontrollers, etc are the applications of a UART.

1). How many wires does UART use?

Hint
2). The UART frame consists of ___________ bits

Hint
3). Which bit is used for error detection?

Hint
4). In which parity the number of 1’s must be even?

Hint
5). ____________ are the UART registers

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6). Which one of the following registers contains settings for the UART?

Hint
7). Which one of the following registers contains information about the UART state or condition?

Hint
8). The universal asynchronous receiver transmitter can be _____________

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9). In which parity the number of 1’s must be odd?

Hint
10). The number of bits sent every second is known as ________ rate

Hint
11). The number of symbols sent every second is known as ________ rate

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12). Which one is a type of UART flag?

Hint
13). Which one is a type of UART register?

Hint
14). What is the standard form of TDRE?

Hint
15). ____________ is an example for data communication equipment

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16). What is the standard form of DTE?

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17). What is the standard form of RDRF?

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18). ____________ is an example for data terminal equipment

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19). What is the standard form of DCE?

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20). What are the advantages of UART?

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21). What is the standard form of RDR?

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22). What are the disadvantages of UART?

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23). What is the function of the UARTn_TXD signal?

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24). The transmitter section of an UART consists of __________

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25). What is the standard form of RSR?

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UART MCQ's with Answers

26). What is the function of UARTn_RTX?

Hint
27). Which one of the following was used to enable or disable the interrupt request?

Hint
28). Which one of the following is a write-only register?

Hint
29). What is the standard form of TDR?

Hint
30). Which one of the following is a divisor latch?

Hint
31). The baud rate of 8-bit UART is ___________

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32). In 8-bit UART 1 byte is equal to ____________ bits

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33). The bits transferred per second is _______ in 8-bit UART

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34). The data in a UART is detected by __________

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Read more about UART 
35). What is the standard form of TSR?

Hint
36). The baud rate of 16 bit UART is ___________

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37). In 16-bit UART 1 byte is equal to ____________ bits

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38). The bits transferred per second is ______ in 16 bit UART

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39). Which register does UART contain?

Hint
40). What is the standard form of SCCR?

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41). _________ are the handshaking signals

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42).The MSP430 family operates in _________ mode

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43). What is the standard form of SCSR?

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44). The speed of the UART is ________ compare to USART

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45). Which one of the following uses data signal for its functioning?

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46). In which one of the following the data is transmitted in the form of bytes?

Hint
47). What is the standard form of UDR?

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48). Which one of the following is an SPI register?

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49). The transmitter type of LIN is ____________

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50). The data rate of a UART is __________

Hint

UART Interview Questions and Answers

51). The data rate of an SPI is __________

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52). Which one of the following scalability is low?

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53). What is the standard form of USR?

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54). The transmitter type of SPI is __________

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55). The data rate of I2C is ___________

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56). Which one of the following scalability is high?

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57). What is the standard form of UBRR?

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58). The maximum speed of a UART is ___________

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59). The maximum speed of an SPI is ___________

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60). What is the standard form of UCR?

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61). The transmitter type of I2C is _______

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62). The maximum speed of I2C is ___________

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63). The maximum distance of a UART is ___________

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64). In a UART, the maximum possible number of devices in a bus is ___________

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65). The associated protocol for serial interface RS-422 is ___________

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66). The master unit is ______ in UART

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67). The maximum speed of RS-485 is ________

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68). The maximum distance of SPI is ___________

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69). In SPI, the maximum possible number of devices in a bus is ___________

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70). The master unit is ______ in USB 2.0

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71). The speed of USB is ______

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72). The speed of SCSI is ______

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73). The maximum distance of I2C is ____________

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74). In I2C, the maximum possible number of devices in a bus is _________

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75). The maximum throughput of RS 232 is _____________

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76). The product availability of RS-232 is _____________

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77). The maximum distance of RS-485 is _________

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78). The maximum throughput of an Ethernet is _____________

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79). The maximum cable length of RS-232 is ___________

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80). The maximum cable length of USB is ______

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UART MCQ's for Exams

81). What is the standard form of PCON?

Hint
82). How many lines does I2C use between multiple slaves and multiple masters?

Hint
83). What is the standard form of UARTFR?

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84). Which one of the following is a write-only register?

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85). The UART transmitter consists of ___________

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Read more about Shift Registers
86). An UART used for _______ access

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87). What is the standard form of MCR?

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88). __________ are the revision identification registers

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89). What is the standard form of MDR?

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90). Which register contains the data to be transmitted?

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91). Which register contains the data which is recently received?

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92). Which register controls the universal asynchronous receiver transmitter frame formatting?

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93). What is the standard form of MSR?

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94). Which register is used to disable/enable the transmission?

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95). Which one of the following registers is a least significant byte of a universal asynchronous receiver transmitter baud rate generator value?

Hint
96). Which one of the following registers is a most significant byte of a universal asynchronous receiver transmitter baud rate generator value?

Hint
97). What is the standard form of UDRE?

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98). What are the applications of a UART?

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99). What is the standard form of DUDRE?

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100).The UART 16550A has ____________FIFO buffers

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