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2006 Mahatma Gandhi University M.Sc Electronic Science Microprocessor and their Interfacing Techniques Question paper

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2006 Mahatma Gandhi University M.Sc Electronic Science Microprocessor and their Interfacing Techniques Question paper

M.Sc. (ELECTRONICS) DEGREE EXAMINATION, MAY 2006

Second Semester

MICROPROCESSOR AND THEIR INTERFACING TECHNIQUES

Time : Three Hours Maximum : 75 Marks

Part A

Answer any 6 questions.

1. Explain the control word format of 8255 in I/O and BSR mode.
2. Explain the mode set register of 8279.
3. Explain the principle of operation of a flash ADC.
4. Explain why strain gauges are usually connected in a bridge configuration.
5. What is the use of a Modem.
6. What are the different types of devices that can be connected on the GPIB?
7. Write a note on virtual 8086 mode of 80386.
8. Compare RISC and CISC processors?
9. What are the uses of delay routines?
(6 X 2 = 12 marks)

Part B

Answer any three questions.

10. Explain the interfacing of a keyboard and microprocessor.
11. Explain with figures the principle of operation of a dual slope ADC.
12. Explain how asynchronous serial data can be sent from a port line using a software routine.
13. What is the concept of virtual memory?
14. Explain with diagrams the interfacing of stepper motor to a microprocessor.
(3 X 5 = 15 marks)

Part C

Answer all questions.

15. (a) Design a microprocessor based stop watch using 8253 and 8255. The stop watch counts up to seconds in steps of 10 ms and displays the time on a 4-digit seven-segment multiplexed display. Draw the required hardware and write an ALP to implement the scheme.
Or
(b) Explain with diagrams the principle of LAN. What are the factors to be considered in the design of a LAN?
16. (a) Draw and explain a circuit for interfacing and ADC with 8086.
Or
(b)Explain the RS232 C Serial data standard and IEEE 488 GPIB standard.
17. (a) Explain with necessary diagrams a microprocessor based control of firing circuit of thyristors.
Or
(b) Draw and explain the architecture of any one of the RISC processors.
18. (a) Draw a hardware circuit for interfacing an electrical motor to 8086 so as to measure its speed and display the same. Write an assembly language program for the system.
Or
(b) Draw a interface circuit for driving a stepper motor using 8086. Write an assembly language program for running the motor through 15 steps in clockwise direction.
(4 X 12 = 48 marks)



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