JNTU B-Tech II Semester Examinations,Microprocessors And Interfacing, Apr/May 2008

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JNTU B.Tech II Semester Examinations,

Microprocessors And Interfacing

, Apr/May 2008

 ( Common to Electronics & Communication Engineering )

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

SET-III

1. (a) Explain the functioning of following resisters of 8086 Microprocessor

i. Segment resisters

ii. Pointer resisters

iii. Index resisters

(b) Discuss briefly about pre-fetch queue in 8086 [12+4]

 

2. (a) Describe the following addressing modes with some examples.

i. Indexed addressing with displacement

ii. I/O port addressing

(b) Explain the meaning of the following 8086 instructions

i. mov [3845h], bx

ii. add ax, [si]

iii. mov bx, 2956h

iv. adc ax, bx [8+8]

 

3. (a) Write an ALP in 8086 to find a maximum number in the array of 10 numbers

(b) Write a recursive program in 8086 ALP to find the sum of the first “n integers [8+8]

 

4. (a) With relevant pin diagrams explain the minimum and maximum mode operations of 8086

(b) Explain briefly about DMA data transfer method. [12+4]

 

5. (a) Distinguish between Mode set control word and BSR control Word of 8255?

(b) Write an ALP in 8086 to generate a symmetrical square wave form with 1KHz frequency? Give the necessary circuit setup with a DAC? [8+8]

 

6. (a) Discuss in detail about the interrupt structure of 8086?

(b) Describe the interrupt vector table of Intel Processors? [8+8]

 

7. (a) What are the important features of 8251?

(b) Explain the following control words of 8251. With suitable Examples.

i. Mode word

ii. Command word [6+10]

 

8. (a) Explain the internal and external program memory as well as data memory of

8051 with the diagram showing their capacities.

(b) Draw the diagram to Interface Program memory of 16K x 8 EPROM to 8051and give its memory map. The address of memory map should start from 0000H. [8+8]

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