Master of Science I (Electronics Science)
Examination: Oct Nov 2016 Semester I (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SJ
335
Wednesday
23/11/2016
10:30 AM
to
01:00 PM
Microcontroller
Interfacing
C
SCT 1.1
Instructions: Answer five questions.
Q.No.1 and 2 are compulsory.
Answer any three questions from Q.No.3 to Q.No.7.
Use of scientific calculator is allowed
Total Marks: 70
Q.1 Select the most correct alternative: 08
In 8051 ports also serves as a bi-directional low-order address
and data bus for accessing external memory.
PORT 0 PORT 1
PORT 2 PORT 3
flag is not present in 8051.
Carry Overflow
Zero Parity
The internal RAM location 00H of 8051 can also be accessed as
Register R0 of bank 0 Direct memory address 00H
Indirect memory address
00H using @R1
All of these
In 8051 pain is used while accessing External ROM.
PSEN RD
WR All of these
An 8 bit ADC connected to 8051 and having 5V Vref can read analog
inputs with approximately precision.
1 mV 2 mV
10 mV 19.53 mV
I/O pins are required to connect the 3x3 matrix keypad with
8051.
3 6
9 12
Cold junction compensation is required for sensor.
LM35 Thermocouple
Thermistor LDR
The second line of characters is addressed at location in 16*2
LCD.
00H-0FH 20H-2FH
80H-8FH C0H-CFH
Page 1 of 2
State whether following statements are True or False: 06
The serial port of 8051 is simplex.
The stack pointer of 8051 decrements before storing data on the stack.
The 8051 has bit-addressable area of 16 bytes.
The Reset pin of 8051 is active high.
The 8051 I/O port pins an drive LED directly.
The GPS module is used to connect the 8051 kit with GSM networks.
Q.2 Explain unconditional jump instructions of 8051. 05
Interface relay with 8051 05
Give specifications of IC LM35 04
Q.3 Draw and explain 8051 as a programmer model. 08
Give a brief overview of 8051 I/O ports. 06
Q.4 What is the need of timers and counters? Give any two applications of each. 08
Explain timer configuration in 8051 06
Q.5 Interface DAC0808 with 8051 microcontroller and write programs to generate
square wave, sawtooth wave, triangular wave.
10
What is optocoupler? Give any two applications of optocoupler. 04
Q.6 Compare LM35, thermistor and a thermocouple 04
Explain with proper schematic diagrams the interfacing of LM35 and
thermistor with the microcontroller.
10
Q.7 With a neat diagram explain interfacing of 16x2 LCD display with the
microcontroller. Draw and explain waveforms for read/write control word and
data to LCD.
08
Write a program to scroll following text on the LCD display, "Solapur
University"