Sreenidhi Institute of Science & Technology(An Autonomous Institution)

Code No: 101EM05B. TECH. III – Year II – Semester Examinations, MAY, 2013 (Regular)MICROPROCESSOR & MICROCONTROLLERS ( EEE, ECE & ECM )

Time: 3 Hours Max. Marks : 70

Note : No additional answer sheets will be provided.Part-A (Objective Type)

Max.Marks:20ANSWER ALL QUESTIONS.

1. List the ISRs addresses and priorities of the vectored interrupts of 8086 microprocessor.

2. What are assembler directives in 8086. Explain any two of them.

3. Explain how the following pins of 8086 MP functions : and .

4. Define bus cycle in 8086.

5. Give the control word format of 8255 programmable peripheral interface.

6. Give the block diagram of 4 - digit seven segment display.

7. What is the difference between microprocessor and a micro controller.

8. Give the block diagram of 8259 priority interrupt controller.

9. Explain the contents of PSW register and TCON register of 8051 micro controller.

10. Define baud rate.Part – B

Max. Marks: 50

ANSWER ANY FIVE QUESTIONS. EACH QUESTION CARRIES 10 MARKS.

1. Explain the architecture of 8086 micro processor in detail with help of a neat sketch.

2. a) Write an assembly language program for 8086 MP to store a set of strings of 100 bytes from one memory location to another in reverse order. [ 5 ]

b) Write an assembly language programme for 8086 MP to sort a set of ten 8 bit numbers stores in memory in ascending order. [ 5 ]

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A 10

3. Explain the pin diagram of 8086 micro processor with help of a neat sketch. Explain the functioning of all the pins in minimum mode.

4. Explain the block diagram of 8255 programmable peripheral interface. Explain the procedure to interface a ADC converter to 8086 MP using 8255 PPI.

5. a) What is an interrupt vector table. [ 3 ]

b) Write a short notes on serial data communication. [ 3 ]

c) Explain the architecture of 8251 USART with the help of a neat sketch.[ 4 ]

6. a) Explain the architecture of 8051 micro controller with help of a neat sketch. [ 5 ]

b) Explain the operation of ports of 8051. [ 5 ]

7. a) What are the various modes of timer / counter operations of 8051 MC. [ 5 ]

b) Write an assembly language program to find sum of first ten natural numbers in 8051 MC. [ 5 ]

8. a) Explain about the interrupts of 8051 MC with registers. [ 5 ]

b) Explain the procedure to interface a DC motor using 8051 MC. [ 5 ]-- 00 -- 00 --

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