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WWW - Manaresults.co - In: Board Diploma Examinations OCT/NOV-2019 Dece-Fifth Semester

This document is an examination paper for the Microcontrollers subject for the DECE-Fifth Semester, conducted in October/November 2019. It consists of two parts: Part A with 10 brief questions worth 30 marks and Part B with 5 comprehensive questions worth 50 marks. The questions cover various topics related to microcontrollers, including comparisons, instruction formats, debugging, interfacing, and programming tasks.

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34 views2 pages

WWW - Manaresults.co - In: Board Diploma Examinations OCT/NOV-2019 Dece-Fifth Semester

This document is an examination paper for the Microcontrollers subject for the DECE-Fifth Semester, conducted in October/November 2019. It consists of two parts: Part A with 10 brief questions worth 30 marks and Part B with 5 comprehensive questions worth 50 marks. The questions cover various topics related to microcontrollers, including comparisons, instruction formats, debugging, interfacing, and programming tasks.

Uploaded by

anilpeddinti415
Copyright
© © All Rights Reserved
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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* C16-EC-502

6630
BOARD DIPLOMA EXAMINATIONS
OCT/NOV-2019
DECE–FIFTH SEMESTER
MICROCONTROLLERS
Time:3 hours Max. Marks: 80

PART – A 3 X 10 = 30

Instructions: 1. Answer all questions.


2. Each question carries Three Marks.
3. Answer should be brief and straight to the point and should not
exceed five simple sentences.

1. Compare Microprocessors and Microcontrollers.

2. State the function of PSW.

3. Give the instruction format of 8051.

4. Define fetch cycle, execution cycle and instruction cycle.

5. Explain the term “ Debugging “.


*
6. Draw any three symbols used in flow charts.

7. Draw the pin diagram of 16X2 LCD module.

8. List any three instruction command codes for programming an LCD module.

9. State the need of opto - coupler for interfacing.

10. List RS232 pins of DB9 Connector.

*
1 [cont..,
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* PART – B 5 X 10 = 50

Instructions: 1. Answer any Five questions


2. Each question carries TEN Marks.
3. Answer should be comprehensive and Criteria forValuation is
the content but not the length of the answer.

11. Draw and explain the functional block diagram of 8051 microcontroller.

12. Explain the following instructions with examples.

1)DA A 2) ORL A, Rn 3) XCHD A,@Ri


4)LCALL ADDR16 5)SETB bit
13. Explain the addressing modes of 8051 with examples.

14. a) Define “ Subroutine “ and explain its use. 4M


b) Explain the sequence of program when subroutine is called
& executed. 6M

15. Write an assembly language program to compute the sum of two10

byte (multi byte) numbers. Assume that the first number is stored in
internal data memory locations 30H to 39H (MS Byte) and the
second number in locations 40H to 49H (MS Byte). Store the 10 byte
sum in locations 40H to 49H (MS Byte).

* 16. Draw and Explain the Interfacing of a 4x4 Matrix Keyboard with 8051.

17. Explain the Pulse width modulation for controlling the speed of small DC

Motor using 8051 Microcontroller.

18. Draw and Explain the interfacing of a driver circuit required to run a

Stepper Motor using 8051 Microcontroller.

*
2
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