Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2152006 Basics Of Micro Computer Systems Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2152006 Date:20/11/2018
Subject Name:Basics of Micro Computer Systems
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) What is Bus? Why is Data bus bidirectional and Address Bus
unidirectional?
03
(b) Give the difference between High Level Language and Low level
Language with appropriate example.
04
(c) Draw the timing diagram of the instruction: LXI D, 2555H. Explain
all the stages of instruction execution.
07
Q.2 (a) Explain the difference between Absolute Decoding and Partial
Decoding.
03
(b) For the microprocessor 8085, explain De-multiplexing of Address
Bus.
04
(c) Explain the Architecture of 8085 with a neat diagram. 07
OR
(c) Write an 8085 assembly language program to count the number of
bytes that are greater than 20H and lesser than 40H from an array of
ten bytes stored on memory locations 3000H onwards. Store such
numbers on memory locations 3500H onwards.
07
Q.3 (a) Write an 8085 ALP to add two 8-bit numbers stored in memory
locations 3000H and 3100H respectively. Store the answer in the
memory locations of your choice.
03
(b) Explain the differences between microprocessors and
microcontrollers.
04
(c) Explain architecture of the microcontroller 8051 using suitable
block diagram.
07
OR
Q.3 (a) Explain the difference between polling and interrupt. 03
(b) Write an 8085 assembly language program to convert a two-digit
BCD number into its equivalent hexadecimal number.
04
(c) For the microcontroller 8051, explain register banks and switching
of register banks using PSW register.
07
Q.4 (a) What is an ISR? Differentiate between a Subroutine and an ISR. 03
(b) List the alternate functions of all the ports of 8051. 04
(c) Using suitable diagram, explain operation of timer 1 in mode 0. 07
OR
Q.4 (a) For the microcontroller 8051, give the list of all the interrupts with
their vector address.
03
(b) For microcontroller 8051, how different modes of timer operations
can be selected? Explain in detail.
04
(c) Using suitable diagram, explain port structure of port 3 of the
microcontroller 8051.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2152006 Date:20/11/2018
Subject Name:Basics of Micro Computer Systems
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) What is Bus? Why is Data bus bidirectional and Address Bus
unidirectional?
03
(b) Give the difference between High Level Language and Low level
Language with appropriate example.
04
(c) Draw the timing diagram of the instruction: LXI D, 2555H. Explain
all the stages of instruction execution.
07
Q.2 (a) Explain the difference between Absolute Decoding and Partial
Decoding.
03
(b) For the microprocessor 8085, explain De-multiplexing of Address
Bus.
04
(c) Explain the Architecture of 8085 with a neat diagram. 07
OR
(c) Write an 8085 assembly language program to count the number of
bytes that are greater than 20H and lesser than 40H from an array of
ten bytes stored on memory locations 3000H onwards. Store such
numbers on memory locations 3500H onwards.
07
Q.3 (a) Write an 8085 ALP to add two 8-bit numbers stored in memory
locations 3000H and 3100H respectively. Store the answer in the
memory locations of your choice.
03
(b) Explain the differences between microprocessors and
microcontrollers.
04
(c) Explain architecture of the microcontroller 8051 using suitable
block diagram.
07
OR
Q.3 (a) Explain the difference between polling and interrupt. 03
(b) Write an 8085 assembly language program to convert a two-digit
BCD number into its equivalent hexadecimal number.
04
(c) For the microcontroller 8051, explain register banks and switching
of register banks using PSW register.
07
Q.4 (a) What is an ISR? Differentiate between a Subroutine and an ISR. 03
(b) List the alternate functions of all the ports of 8051. 04
(c) Using suitable diagram, explain operation of timer 1 in mode 0. 07
OR
Q.4 (a) For the microcontroller 8051, give the list of all the interrupts with
their vector address.
03
(b) For microcontroller 8051, how different modes of timer operations
can be selected? Explain in detail.
04
(c) Using suitable diagram, explain port structure of port 3 of the
microcontroller 8051.
07
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2
Q.5 (a) For the microcontroller 8051, explain the instruction DIV AB using
suitable example.
03
(b) An 8-bit Hex number is stored in ROM memory location 20F0H.
Write an ALP for the microcontroller 8051 to get 2?s complement
of this number and store the result in internal RAM memory
location 40H.
04
(c) Write an ALP for the microcontroller 8051 to add ten bytes stored
in internal RAM locations 50H onwards. Store the result in register
R7 of register bank 1 and store the carry of the answer in register
R7 of register bank 0.
07
OR
Q.5 (a) For the microcontroller 8051, explain the instruction MOVX
A,@DPTR using suitable example.
03
(b) For the microcontroller 8051, explain the execution of PUSH and
POP instructions.
04
(c) For the microcontroller 8051, write an assembly language program
to generate a square wave of 10KHz frequency at P1.7 using Timer
0 in Mode 2 with crystal frequency of 12 MHz. Show the
calculations of time delay generation.
07
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This post was last modified on 20 February 2020