This document is an exam for a course on microprocessors and microcontrollers. It contains two parts - Part A with 10 multiple choice questions covering topics like the flag bits of the 8086 microprocessor, string instructions of 8086, addressing modes of 8086, features of 8051 microcontroller, and registers of 8259 PIC. Part B contains 8 questions requiring longer answers, covering topics such as architecture of 8086, instruction set of 8086, interfacing memories and peripherals to 8086, interrupt handling, addressing modes and timers of 8051, serial communication using 8051 ports, interfacing a keypad to 8051, assembler directives, operating modes of 8255 PPI, and using microcontrollers for washing

1. Sreenidhi Institute of Science & Technology
(An Autonomous Institution)
Code No: 3D605
B. TECH. III – Year II – Semester Examinations, May 2015 (Regular)
MICROPROCESSORS & MICROCONTROLLERS (Common to EEE & ECM)
Time: 3 Hours Max. Marks: 70
Note: No additional answer sheets will be provided.
Part - A
Max.Marks:20
ANSWER ALL QUESTIONS.
1. Name the various flag bits available in 8086 microprocessor.
2. List few string instructions of 8086.
3. Give the BSR mode format of 8255.
4. What are the 8086 interrupt types?
5. List the features of 8051 microcontroller.
6. What is the purpose of ADC and DAC?
7. List the various addressing modes present in 8086.
8. What is the use of Keyboard and display controller?
9. What is the use of PCON register?
10. What are the different registers present in 8259 PIC?
Part – B
Max.Marks:50
ANSWER ANY FIVE QUESTIONS. EACH QUESTION CARRIES 10 MARKS.
1. a. With the neat sketch explain the architecture of 8086 processor.
b. Explain the instruction set of 8086 Micro Processor.
2. a. Write an ALP for 8086 to find out negative nos. from an array of signed numbers.
b. Explain the pin diagram of 8086 in minimum mode operation with neat sketch.
3. a. Explain Interfacing of two 4kX8 EPROMS and two 4kX8 SRAM chips with 8086.
Select suitable memory map.
b. What are the tasks involved in keyboard interface to 8086?
4. a. Discuss the sequence of operations performed in the interrupt acknowledge
cycle.
b. Draw the block diagram of 8251 USART and explain.
5. a. Discuss about various addressing modes of 8051.
b. Explain with waveforms, the different modes of counter/timer in 8051.
6. a. Explain how serial data communication is done with 8051 serial ports.
b. With a neat circuit diagram explain how a 4 х 4 keypad is interfaced with 8051
microcontroller
7. a. Briefly explain the assembler directives.
b. Explain all the operating modes of the 8255 PPI.
8. a. Explain how microcontrollers and microprocessors can be used for the washing
machine control application.
b. Describe 8259 PIC architecture and interfacing, cascading of interrupt controller
and its importance.
-- 00 -- 00 --
Page 1 of 1
A12