Jawaharlal Nehru Technological University Hyderabad 2011-3rd Year B.Tech Computer Science and Engineering MicroprocessorsI And Interfacing I Semester s, (Common to Information Technology, Instrumen

Code No: 07A50504 R07 Set No. 4
III B.Tech I Semester Examinations,May 2011
MICROPROCESSORS AND INTERFACING
Common to info Technology, Instrumentation And Control
Engineering, Electronics And Computer Engineering, Computer Science
And Engineering
Time: three hours Max Marks: 80

ans any 5 ques.
All ques. carry equal marks

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1. (a) discuss the instruction support of 8051 to learn data from lookup tables stored in EPROM?
(b) discuss the counter/timer operation of 8051? discuss how this can give clock for baud rate setting in serial data transmission through 8051? [8+8]

2. (a) discuss the real address mode operation of 80386 and show how physical address is generated?
(b) Bring out the architectural dierences ranging from 80386 and Pentium processor.[8+8]

3. (a) Write a sequence of instructions to communicate to a modem using 8251 at address 080H.
(b) provide the specications of
i. RS-232C
ii. RS-423A [8+8]

4. Write an initialization sequence for an 8259 that is the only 8259 in an 8086 based system, with an even address of 0040H that will reason.
(a) Request to the level triggered mode
(b) IR0 request to an interrupt kind 28
(c) SP/EN to output a disable signal to the data-bus transceivers.
(d) The ISR bits to be cleared automatically at the end of 2nd INTA pulse.
(e) The IMR to be cleared.
(f) The highest priority interrupt will be IR3. [16]

5. (a) explain different branch instruction of 8086 microprocessor, that are useful for relocation?
(b) Using a do-while construct, develop a sequence of 8086 instructions that reads a character string from the keyboard and after pressing the enter key the character string is to be displayed again. [8+8]

6. 8086 processor do not give memory indirect addressing mode. Show all possible ways to access a word from memory where the segment address is provided in location C000H:1000H and the oset is provided in location C000H:1002H. provide the instruction sequence for every addressing mode of 8086.?[16]

7. (a) Draw the block diagram of 8279 and discuss the functionality?
(b) Design a counter kind ADC using 8255? Make necessary assumptions and provide the software listing? [8+8]

8. What is function of ready pin in 8086. Draw the circuit diagram for wait state generation ranging from 0 and seven wait status and draw the corresponding timing diagram.[16]

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Earning:   Approval pending.