IC 8253 and IC 8259 interview questions and answers

By admin | April 14, 2007
  1. What is IC 8253?
  2. How many pins does IC 8253 have?
  3. How many counters are there in 8253?
  4. What is the size of counters in 8253?
  5. With binary & BCD counters, what is the range of count?
  6. Explain control word format of 8253?

  7. Define & explain mode ‘0′ of 8253?
  8. Define & explain mode ‘1′ of 8253?
  9. Define & explain mode ‘2′ of 8253?
  10. Define & explain mode ‘3′ of 8253?
  11. Define & explain mode ‘4′ of 8253?
  12. Define & explain mode ‘5′ of 8253?
  13. What is the difference between software and hardware triggered modesof 8253?
  14. What is the difference between 8253 and 8254?
  15. What is read back command in 8254?
  16. What are the applications of 8253?
  17. Explain block diagram IC 8253?
  18. Explain the logic of 8253 program.
  19. Explain the interfacing of 8253 with 8086.
  20. What is IC 8259?
  21. How many pins does IC 8259 have?
  22. Explain all initialization and operational command word format of 8259?
  23. With single 8259 how many interrupts are possible?
  24. With cascading mode of 8259 how many interrupts are possible?
  25. How many 8259 ICs will be required for cascading mode?
  26. What is the difference between polled command mode and vectored (interrupt driven) command mode of 8259?
  27. What are the applications of 8259?
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2 Comments on IC 8253 and IC 8259 interview questions and answers

  1. ram
    Posted 4/10/2008 at 1:34 am | Permalink

    ans 1: it s a timer/counter IC.

  2. ram
    Posted 4/10/2008 at 1:35 am | Permalink

    ans 3: 3 coutes counter 0,1,2

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