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Stucor Qp-Ec8691

The document is a question paper for the subject Microprocessors and Microcontrollers. It contains 3 parts - Part A with 10 multiple choice questions carrying 2 marks each, Part B with 5 questions carrying 13 marks each, and Part C with 1 question carrying 15 marks. Students need to answer all questions in 150 minutes for a total of 100 marks. The questions cover topics related to 8086, 8051 and 8255 microprocessors as well as A/D converters, DMA controllers, addressing modes, interfacing concepts and assembly language programming.

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0% found this document useful (0 votes)

133 views21 pages

Stucor Qp-Ec8691

Uploaded by

KrisHnA 2k

We take content rights seriously. If you suspect this is your content, claim it here.

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Download as PDF, TXT or read online on Scribd

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DOWNLOADED FROM STUCOR APP

Reg. No. :

Question Paper Code : 40454

B.E./B.Tech. DEGREE EXAMINATIONS, NOVEMBER/DECEMBER 2021.

Fifth / Sixth Semester

Electronics and Communication Engineering

EC 8691 – MICROPROCESSORS AND MICRO CONTROLLERS

(Common to Biomedical Engineering / Computer Science and Engineering/

Computer and Communication Engineering / Medical Electronics /
Information Technology)

(Regulations 2017)

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 × 2 = 20 marks)

1. What are the advantages of using the MOVS and CMPS instructions over the
MOV and CMP instructions while working with strings?

2. If a data segment begins at address 2400H, what is the address of the last
location in the segment?

3. Draw the timing diagram for an interrupt acknowledgement on an 8086

system.

4. List the features of multi core processors.

5. State the important functions of an I/O interface.

6. Calculate the resolution of an 8-bit A/D converter assuming the voltage range
of the input as –10V to +10V.

7. Write an assembly language program to clear the accumulator and then add ‘3’
to the accumulator ten times.

8. Why do 55H and AAH is used to test the ports of 8051?

9. Compare : microprocessor and microcontroller.

10. Which register has the SMOD bit, and what is its status when the 8051 is
powered up?

Refer STUCOR APP for Complete Notes

DOWNLOADED FROM STUCOR APP

PART B — (5 × 13 = 65 marks)

11. (a) Express the categories under which the instructions in the instruction set
of the 8086 microprocessor are grouped. Explain the operation of any two
instructions in each group.
Or
(b) State the advantages of modular programming and illustrate the process
by which the modules assembled separately are linked together and
programs are prepared for execution.

12. (a) Differentiate between minimum and maximum mode of operation of 8086
microprocessor, and sketch the maximum mode configuration.
Or
(b) Differentiate closely coupled and loosely coupled configurations of 8086
based multiprocessing systems, and illustrate the general concepts
underlying the schemes for establishing priority in a loosely coupled
multiprocessor system.

13. (a) Describe the operating modes and control words of Programmable
Peripheral Interface (8255). Also specify the handshaking signals and
their functions if port A of 8255 is setup as input port in mode 1.

Or
(b) Discuss in detail the working of an independent DMA controller and its
data transfer modes. Also, show the general organization of a one
channel DMA controller and its principal connections.

14. (a) With a functional block diagram, briefly discuss the architecture of the
8051 microcontroller.

Or
(b) (i) Discuss on the different types of addressing modes supported by the
8051 microcontroller with examples. (10)
(ii) State the merits and demerits of accessing memory using various
addressing modes. (3)

15. (a) In a certain application, 256K bytes of NV-RAM are needed to store data
collected by an 8051 microcontroller. Show the connection of an 8051 to a
single 256K × 8 NV-RAM chip.
Or
(b) (i) Differentiate RET and RETI instructions. Explain why RET cannot
be used as the last instruction of an ISR instead of RETI. (6)
(ii) Illustrate the options available with Timer Mode (TMOD) register
of 8051. (7)

2 40454

Refer STUCOR APP for Complete Notes

DOWNLOADED FROM STUCOR APP

PART C — (1 × 15 = 15 marks)

16. (a) Use a keyboard / display controller (8279) to interface a 64-key keyboard
and an eight digit seven-segment display. Also discuss the working
principle of 8279 with appropriate commands needed to be given before
the CPU sends the characters to be displayed to the 8279 and before
inputting data from the FIFO memory.

Or
(b) Interface a temperature sensor to the 8051 microcontroller through an
analog to digital converter and outline the steps to be followed to get data
from analog input of ADC into the microcontroller.

—————————

3 40454

Refer STUCOR APP for Complete Notes

DOWNLOADED FROM STUCOR APP

Reg. No. :
*X10371*

Question Paper Code : X 10371

B.E./B.Tech. DEgREE ExamiNaTioNs, Nov/DEc 2020 AND APRIL/ MAY 2021
Fifth/sixth semester
Electronics and communication Engineering
Ec 8691 – micRopRocEssoRs aND micRocoNTRollERs
(common to Biomedical Engineering/computer science and Engineering/ computer
and communication Engineering/medical Electronics/information Technology)

(Regulations 2017)

Time : Three Hours Maximum : 100 Marks

Answer all questions

Part – A (10×2=20 Marks)
1. Write the flags of 8086.
2. List the types of interrupts in 8086.
3. How clock signal is generated in 8086 ? What is the maximum internal clock
frequency of 8086 ?
4. What is the function of MN/MX pin ?
5. What are the signals available for serial communication ?
6. Define conversion time.
7. Write a program to mask the 0th and 7th bit using 8051.
8. Write a program to find the 2’s complement using 8051.
9. Define the operating model 0 of 8051 serial ports.
10. Give the different types of ADC.

Part – B (5×13=65 Marks)

11. a) How would you show your understanding of internal hardware architecture
of 8086 microprocessor with neat diagram ?
(OR)
b) What are the various addressing modes of 8086 microprocessor with examples ?

Refer STUCOR APP for Complete Notes

DOWNLOADED FROM STUCOR APP

X 10371 *X10371*

12. a) Draw the pin diagram of 8086 processor and explain all the signals.
(OR)

b) i) Explain in detail about closely coupled configurations. (6)

ii) Discuss on loosely coupled configurations in detail. (7)

13. a) Draw the block diagram of 8279 and explain the function of each.
(OR)
b) Explain the operation of DMA controller 8237 with neat diagrams.

14. a) With neat sketch explain the architecture of 8051 microcontroller.

(OR)

b) i) Explain the different addressing modes of 8051. (6)

ii) List the various instructions available in 8051 microcontroller. (7)

15. a) With neat sketch block diagram of interfacing 64KB of External RAM and
64KB of External ROM with the 8051 Microcontroller.
(OR)
b) Draw and explain the ADC interfacing using 8051.

Part – C (1×15=15 Marks)

16. a) i) Write an 8086 ALP to find the sum of numbers in an array of 10 elements. (8)
ii) Write an 8086 ALP to find the largest number and smallest number in an
array. (7)
(OR)
b) Examine the effectiveness of the minimum mode and maximum mode of
operations in 8086 in detail.

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