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
Hint
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 _____________
Hint
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
Hint
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
Hint
16). What is the standard form of DTE?
Hint
17). What is the standard form of RDRF?
Hint
18). ____________ is an example for data terminal equipment
Hint
19). What is the standard form of DCE?
Hint
20). What are the advantages of UART?
Hint
21). What is the standard form of RDR?
Hint
22). What are the disadvantages of UART?
Hint
23). What is the function of the UARTn_TXD signal?
Hint
24). The transmitter section of an UART consists of __________
Hint
25). What is the standard form of RSR?
Hint
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 ___________
Hint
32). In 8-bit UART 1 byte is equal to ____________ bits
Hint
33). The bits transferred per second is _______ in 8-bit UART
Hint
34). The data in a UART is detected by __________
Hint
Read more about UART
35). What is the standard form of TSR?
Hint
36). The baud rate of 16 bit UART is ___________
Hint
37). In 16-bit UART 1 byte is equal to ____________ bits
Hint
38). The bits transferred per second is ______ in 16 bit UART
Hint
39). Which register does UART contain?
Hint
40). What is the standard form of SCCR?
Hint
41). _________ are the handshaking signals
Hint
42).The MSP430 family operates in _________ mode
Hint
43). What is the standard form of SCSR?
Hint
44). The speed of the UART is ________ compare to USART
Hint
45). Which one of the following uses data signal for its functioning?
Hint
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?
Hint
48). Which one of the following is an SPI register?
Hint
49). The transmitter type of LIN is ____________
Hint
50). The data rate of a UART is __________
Hint
UART Interview Questions and Answers
51). The data rate of an SPI is __________
Hint
52). Which one of the following scalability is low?
Hint
53). What is the standard form of USR?
Hint
54). The transmitter type of SPI is __________
Hint
55). The data rate of I2C is ___________
Hint
56). Which one of the following scalability is high?
Hint
57). What is the standard form of UBRR?
Hint
58). The maximum speed of a UART is ___________
Hint
59). The maximum speed of an SPI is ___________
Hint
60). What is the standard form of UCR?
Hint
61). The transmitter type of I2C is _______
Hint
62). The maximum speed of I2C is ___________
Hint
63). The maximum distance of a UART is ___________
Hint
64). In a UART, the maximum possible number of devices in a bus is ___________
Hint
65). The associated protocol for serial interface RS-422 is ___________
Hint
66). The master unit is ______ in UART
Hint
67). The maximum speed of RS-485 is ________
Hint
68). The maximum distance of SPI is ___________
Hint
69). In SPI, the maximum possible number of devices in a bus is ___________
Hint
70). The master unit is ______ in USB 2.0
Hint
71). The speed of USB is ______
Hint
72). The speed of SCSI is ______
Hint
73). The maximum distance of I2C is ____________
Hint
74). In I2C, the maximum possible number of devices in a bus is _________
Hint
75). The maximum throughput of RS 232 is _____________
Hint
76). The product availability of RS-232 is _____________
Hint
77). The maximum distance of RS-485 is _________
Hint
78). The maximum throughput of an Ethernet is _____________
Hint
79). The maximum cable length of RS-232 is ___________
Hint
80). The maximum cable length of USB is ______
Hint
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?
Hint
84). Which one of the following is a write-only register?
Hint
85). The UART transmitter consists of ___________
Hint
Read more about Shift Registers
86). An UART used for _______ access
Hint
87). What is the standard form of MCR?
Hint
88). __________ are the revision identification registers
Hint
89). What is the standard form of MDR?
Hint
90). Which register contains the data to be transmitted?
Hint
91). Which register contains the data which is recently received?
Hint
92). Which register controls the universal asynchronous receiver transmitter frame formatting?
Hint
93). What is the standard form of MSR?
Hint
94). Which register is used to disable/enable the transmission?
Hint
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?
Hint
98). What are the applications of a UART?
Hint
99). What is the standard form of DUDRE?
Hint
100).The UART 16550A has ____________FIFO buffers
Hint
