UART

Embedded System

This set of Embedded Systems Multiple Choice Questions & Answers (MCQs) focuses on “UART”.

1. What does UART stand for?
a) universal asynchronous receiver transmitter
b) unique asynchronous receiver transmitter
c) universal address receiver transmitter
d) unique address receiver transmitter

2. How is data detected in a UART?
a) counter
b) timer
c) clock
d) first bit

3. Which of the signal is set to one, if no data is transmitted?
a) READY
b) START
c) STOP
d) TXD

4. What rate can define the timing in the UART?
a) bit rate
b) baud rate
c) speed rate
d) voltage rate

5. How is the baud rate supplied?
a) baud rate voltage
b) external timer
c) peripheral
d) internal timer

6. Which is the most commonly used UART?
a) 8253
b) 8254
c) 8259
d) 8250

7. Which company developed 16450?
a) Philips
b) Intel
c) National semiconductor
d) IBM

8. What does ADS indicate in 8250 UART?
a) address signal
b) address terminal signal
c) address strobe signal
d) address generating signal

9. Which of the following signals are active low in the 8250 UART?
a) BAUDOUT
b) DDIS
c) INTR
d) MR

10. Which of the signal can control bus arbitration logic in 8250?
a) MR
b) DDIS
c) INTR
d) RCLK

11. Which of the following is used to reset the device in 8250?
a) MR
b) DDIS
c) INTR
d) RCLK

12. Which provides an input clock for the receiver part of the UART 8250?
a) RD
b) RCLK
c) MR
d) DDIS

13. Which of the following is a general purpose I/O pin?
a) OUT1
b) RD
c) ADS
d) MR

14. Which of the following indicate the type of access that the CPU needs to perform?
a) MR
b) RD
c) ADS
d) RCLK

15. Which pins are used for additional DMA control?
a) RXRDY
b) RD
c) MR
d) INR

16. Which of the following are not used within the IBM PC?
a) TXRDY
b) BAUDOUT
c) ADS
d) OUT2

17. Which pins are used to connect an external crystal?
a) INR
b) ADS
c) XIN
d) SIN

18. Which UART is used in MC680 by 0 design?
a) Intel 8250
b) 16450
c) 16550
d) MC68681

19. Which of the following have large FIFO buffer?
a) 8253
b) 8250
c) 16550
d) 16450

20. Which of the following has a quadruple buffered receiver and a double buffered transmitter?
a) Intel 8250
b) 16450
c) 16550
d) MC68681

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