JNTU B.Tech II Semester Examinations, MICROPROCESSORS AND MICRO CONTROLLERS, Apr/May 2008

JNTU B.Tech II Semester Examinations, MICROPROCESSORS AND MICRO CONTROLLERS

,Apr/May 2008

(Electrical & Electronic Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

SET-IV

1. Draw the maximum mode block diagram of 8086 processor and explain its function.

[16]

 

2. (a) What is a MACRO? How do you pass parameters to MACROs?

(b) Write a program to implement FOR loop using instructions of 8086. [8+8]

 

3. (a) Explain the basic steps involved in an A/D converter

(b) Explain the block diagram of an ADC 0808/0809. [8+8]

 

4. (a) Explain the Static Ram interfacing

(b) Interface TWO 4KX8 EPROMS and two 4K X 8 RAM chips with 8086.Select

suitable memory map. [6+10]

 

5. (a) Draw the internal block diagram of 8251 and explain about each block in

detail.

(b) Distinguish between Synchronous and Asynchronous data formats. [10+6]

 

6. (a) Explain the following instructions?

i. ANL P0, #0Fh

ii. CPL A

iii. CLR ACC.5

iv. XRL add, #n

(b) Write 8051 program to OR the contents of ports 1 and 2, put the result in

external RAM location 0102h. [8+8]

 

7. (a) Write 8051 program to initialize timer 1 in mode 1.

(b) Write 8051 program to generate 2 kHz square waves on pin P1.0 of port 1

using Timer 0 auto reload mode. [8+8]

 

8. (a) Interface the 7-segment displays in time-multiplexing and display select method

and explain the same.

(b) Write a 8051 program to control the operation of a 7-segment displays with

time multiplexing and display method. Assume that the 7-segment codes for

the characters to be displayed are at 40,42,44,46H respectively in the internal

RAM. Whereas, the cathode select codes for each of the displays are at

41,43,45,47H respectively. [8+8]

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