Jawaharlal Nehru Technological University Hyderabad 2012-2nd Year B.E JNTU, EEE Branch, MICROPROCESSORS AND MICROCONTROLLERS subject of BTech III Semester s, emr/uary -2011-12 - Question Paper

(ELECTRICAL AND ELECTRONICS ENGINEERING)
Time: three hours Max. Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. explain the architecture of 8086 processor with a neat block diagram. [16]
2.a) explain the machine language instruction formats of 8086
b) Write an ALP for 8086 to organize a list of 16-bit numbers in ascending order. [8+8]
3.a) discuss mode-1 and mode-2 operation of 8255.
b) Interface an 8255 with 8086 so as to have port A address 00, port B address 02,port C address 01
and CWR address 03. [8+8]
4.a) explain the different operating modes of 8259.
b) explain about the initialization command words of 8259 and their sequence in detail. [8+8]
5.a) discuss the IEEE-488 protocol for data communication.
b) Write the asynchronous mode transmitter and receiver data formats of 8251.[8+8]
6.a) discuss different addressing modes of 8051 with examples.
b) Write an assembly language program for 8051 to convert a hex number to a BCD number. [8+8]
7. discuss the interfacing of key board controller to 8051. [16]
8. Write short notes on:
a)General bus operation of 8086.
b) Communication from 8051.
c) Programming of 8051 timers. [16]

Earning:   Approval pending.