Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2152409 Microcontroller For Power Electronics Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2152409 Date: 21/11/2019
Subject Name: Microcontroller for Power Electronics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain in brief: EEPROM, EPROM, DRAM 03
(b) Draw the block diagram of microcontroller 8051. 04
(c) Differentiate between microcontroller and microprocessor. 07
Q.2 (a) State important criterion for the selection of microcontroller. 03
(b) Explain the architecture of 8085 microprocessor. 04
(c) Write an ALP to generate a control signal on P1.5 to operate a buck converter
at 10kHz with 25% duty cycle. Assume crystal frequency of 12MHz. Write
appropriate comments for each step.
07
OR
(c) Calculate the time delay in the following code assuming a crystal frequency of
12MHz and machine cycle as given in bracket:
DELAY: MOV R3,#100; (1)
HERE: NOP; (1)
NOP; (1)
NOP; (1)
NOP; (1)
NOP; (1)
DJNZ R3,HERE (2)
RET (2)
07
Q.3 (a) Explain the meaning of following 8051 instructions with an example:
CPL, DJNZ, SETB
03
(b) Explain TMOD register. 04
(c) What is an assembler? State 5 assembler directives of 8051. Explain any two. 07
OR
Q.3 (a) Explain the meaning of following 8051 instructions with an example:
MOV, MOVC, MOVX
03
(b) Write an ALP to multiply two 1-digit BCD numbers stored in R3 and R4 using
repetitive addition method. Store the result in R0.
04
(c) List and explain I/O ports of 8051 and their functions. Also, state which ports
are internally pulled up at 5V through resistors.
07
Q.4 (a) Calculate the time of one machine cycle of 8051 microcontroller if a crystal of
18MHz is connected to it.
03
(b) Write a program to blink LEDs connected at port 1 continuously with some
specific delay.
04
(c) Explain different addressing modes of 8051 with example. 07
OR
Q.4 (a) What is the function of interrupts in 8051? List various interrupts available in
8051.
03
(b) What do you mean by stack? Explain in brief w.r.t 8051. 04
(c) Discuss PSW register in detail. 07
Q.5 (a) What is a subroutine in 8051? Explain in brief with a suitable short example. 03
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2152409 Date: 21/11/2019
Subject Name: Microcontroller for Power Electronics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain in brief: EEPROM, EPROM, DRAM 03
(b) Draw the block diagram of microcontroller 8051. 04
(c) Differentiate between microcontroller and microprocessor. 07
Q.2 (a) State important criterion for the selection of microcontroller. 03
(b) Explain the architecture of 8085 microprocessor. 04
(c) Write an ALP to generate a control signal on P1.5 to operate a buck converter
at 10kHz with 25% duty cycle. Assume crystal frequency of 12MHz. Write
appropriate comments for each step.
07
OR
(c) Calculate the time delay in the following code assuming a crystal frequency of
12MHz and machine cycle as given in bracket:
DELAY: MOV R3,#100; (1)
HERE: NOP; (1)
NOP; (1)
NOP; (1)
NOP; (1)
NOP; (1)
DJNZ R3,HERE (2)
RET (2)
07
Q.3 (a) Explain the meaning of following 8051 instructions with an example:
CPL, DJNZ, SETB
03
(b) Explain TMOD register. 04
(c) What is an assembler? State 5 assembler directives of 8051. Explain any two. 07
OR
Q.3 (a) Explain the meaning of following 8051 instructions with an example:
MOV, MOVC, MOVX
03
(b) Write an ALP to multiply two 1-digit BCD numbers stored in R3 and R4 using
repetitive addition method. Store the result in R0.
04
(c) List and explain I/O ports of 8051 and their functions. Also, state which ports
are internally pulled up at 5V through resistors.
07
Q.4 (a) Calculate the time of one machine cycle of 8051 microcontroller if a crystal of
18MHz is connected to it.
03
(b) Write a program to blink LEDs connected at port 1 continuously with some
specific delay.
04
(c) Explain different addressing modes of 8051 with example. 07
OR
Q.4 (a) What is the function of interrupts in 8051? List various interrupts available in
8051.
03
(b) What do you mean by stack? Explain in brief w.r.t 8051. 04
(c) Discuss PSW register in detail. 07
Q.5 (a) What is a subroutine in 8051? Explain in brief with a suitable short example. 03
2
(b) Draw flowchart to interface seven segment display with 8051. 04
(c) State various types of Jump and Loop instructions. Explain any three with
examples.
07
OR
Q.5 (a) Write appropriate comments to explain the function carried out by following
program segment
ORG 0x0300
SETB PSW.4
SETB PSW.3
MOV 0x18,#0xFF
XRL A,R0
INC A
END
03
(b) State the similarities and differences between following instructions.
ADD A, @R1 and ADD A, R1
04
(c) How to interface a 4 x 4 key board with 8051? Draw circuit diagram and
flowchart describing the programming logic.
07
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This post was last modified on 20 February 2020