CS2252-ut3 QB

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PART A 1. What is a Floating Point Coprocessor? 2. How does CPU differentiate the 8087 instruction from its own instructions? 3. In what ways are the standard microprocessor and co- processor differ from each other? 4. How does the main processor distinguish its instructions from those for the 8087 as it fetches instructions from memory? 5. What are the two internal sections of 8087 architecture? 6. List any four 8087 data formats 7. How 8089 operates in loosely coupled configuration and tightly coupled configuration? 8. What are the requirements to be met while interfacing memory or I/O devices to 8085 processor? 9. Why a latch is used for an O/P port, but a tri-state buffer can be used for an input port? 10. Why are the port lines of programmable port devices automatically put in the input mode when the device is first powered up or reset? 11. What are the operating modes of 8255? 12. What are the modes of operation of 8237? 13. What is bus stealing? 14. How to change the direction of the stepper motor from clockwise direction to anticlockwise direction using a program segment. 15. What is difference between watch dog timer and ordinary timer? 16. What is the difference between MOV X and MOV? 17. In the program status word of 8051, the bits RS0 and RS1 are 1 and 0, then which register

Transcript of CS2252-ut3 QB

PART A

1. What is a Floating Point Coprocessor?

2. How does CPU differentiate the 8087 instruction from its own instructions?3. In what ways are the standard microprocessor and co-processor differ from each other?4. How does the main processor distinguish its instructions from those for the 8087 as it fetches instructions from memory?

5. What are the two internal sections of 8087 architecture?

6. List any four 8087 data formats

7. How 8089 operates in loosely coupled configuration and tightly coupled configuration?8. What are the requirements to be met while interfacing memory or I/O devices to 8085 processor?

9. Why a latch is used for an O/P port, but a tri-state buffer can be used for an input port?

10. Why are the port lines of programmable port devices automatically put in the input mode when the device is first powered up or reset?

11. What are the operating modes of 8255?

12. What are the modes of operation of 8237?

13. What is bus stealing?

14. How to change the direction of the stepper motor from clockwise direction to anticlockwise direction using a program segment.

15. What is difference between watch dog timer and ordinary timer?

16. What is the difference between MOV X and MOV?

17. In the program status word of 8051, the bits RS0 and RS1 are 1 and 0, then which register

bank is selected for operation?

18. What is the size of the on-chip program memory and on-chip data memory of 8051 microcontroller?19. List the features of the parallel ports of 8051 microcontroller. 20. What is baud rate for mode 0 operation of the serial port of 8051?

21. What is co-processor?

22. How does co-processor identify the instruction meant for it?23. What are the features of closely coupled multiprocessor systems?24. What are the three basic schemes of Loosely coupled configuration?25. Draw the flowchart to show the communication between 8086 and 8087.26. What is the function of TAG register in 8087 NDP?

27. What do you mean by CCP in an I/O processor?

28. List out three modes on data transmission.29. What signals are required between a 8085 processor and an interrupt controller for interrupt driven data transfer?30. What are the signals and instructions available in 8085 processor for serial I/O

communication?31. What is DMA?32. What is the use of IRR (Interrupt Request Register)?

33. State the use of cascading signals of 8259 programmable interrupt controller.34. Name the sensors used in a microprocessor based temperature controller.35. What are the differences between a microprocessor and microcontrollers?36. How is the section of particular register bank done in 8051?37. What are the advantages of using a microcontroller in place of a microprocessor?38. What are the functions of the following signals of 8051?ALE/PROG,PSEN.39. What are the sources of interrupts in 8051?

40. Mention any two applications that uses ADC and DAC.PART B 1. a) Explain the architecture of 8087 numeric data processor.

(16)(OR)

b) Explain the architecture of 8089 I/O processor.

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2. a) How is the communication between CPU and IOP being done?

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b) Explain the operating modes of 8253 timer

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3. a) Discuss briefly about keyboard/display controller

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b) What is DMA? Explain the DMA based data transfer using 8237 DMA controller(16)

4. a) Draw the architectural block diagram of 8259 programmable interrupt controller and explain.

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b) i) Describe the functions of the signals present in 8051

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ii) How do you interface 8051 microcontroller with an ADC? Explain

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5. a) How do you interface 8051 microcontroller with keyboard? Explain in detail

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b) How a DAC is interfaced with 8051?

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6. a) i) With a neat sketch explain the general interconnections between 8086 and 8087.(10)

ii) Write a detailed note on the data types supported by 8087 in detail.

(6)

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b) Draw the architecture of 8089 I/O processor and explain its functionalities.

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7.a) Explain the loosely coupled system configuration with different bus arbitration schemes.

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b) Discuss how 8251 is used for serial data communication

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8.a) Explain the operating modes of 8255 programmable peripheral interface.

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b) List the major components of 8279 keyboard display interface and explain their functions

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9. a) What is DMA? Explain the DMA based data transfer using 8237 DMA controller(16)

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b) What is timer/counter? Explain the 16-bit timer mode and 8-bit auto-reload mode of 8051 microcontroller

(16)10.a) i) Describe about serial port interface of 8051

(8) ii) How do you interface 8051 microcontroller with an ADC? Explain

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b) Explain how an LCD and keyboard is interfaced with 8051

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