8251 USART interview questions

1. What is IC 8251?
2. How many pins does IC 8251 have?
3. What is USART?
4. Why 8251 is called a USART?
5. What is simplex half & full duplex modes of communication?
6. What is the difference between asynchronous & synchronous mode of communication?
7. Explain control word format of 8251?
8. Define frame in asynchronous communication and draw it.
9. Define baud rate.
10. Define bit rate.
11. Define mode word register of 8251 for asynchronous mode..
12. Define mode word register of 8251 for sync mode..
13. What is the significance of SYNC DETECT signal in 8251?
14. What is the significance of BREAK DETECT signal in 8251?
15. Define command word register of 8251.
16. Define status word register of 8251.
17. What are the applications of 8251?
18. Whether write operation is possible with status word register?
19. Whether operation read is possible with command word register?
20. What is parity error in 8251?
21. What is over run error in 8251?
22. What is frame error in 8251?
23. What is hunt mode in 8251?
24. Explain block diagram IC 8251?
25. Explain the logic of 8251 program.
26. Explain the interfacing of 8251 with 8086.