M.Sc. (Semester (CBCS) Examination Mar/Apr-2018
Electronic Science
MICROCONTROLLERS AND INTERFACING
Time: 2½ Hours
Max. Marks: 70
Instructions: Questions 1 and 2 are compulsory. Answer any three questions from Q.3 to Q.7. All questions carry equal marks. Use of scientific calculator is allowed.
Q.1

Choose the alternatives given below.
06
What decides the bit size of the microcontroller?
Data bus
Address bus
ALU
Program counter
What is the size of on-chip data memory of 8051?
128 bytes
4KB
256 bytes
8KB
How many interrupts are there for 8051?
2
4
5
7
What is the range of LM35 temperature sensor?
-500C to 1500C
00C to 1500C
00C to 1000C
-500C to 1000C
Transducer used for measurement of displacement is
Thermister
LVDT
LDR
Thermocouple
The register is not bit addressable.
P0
SCON
TCON
SP
State true or false.
08
There are 20 SFRs available in 8051.
MCU 8051 have 4KB of program memory.
Range of ADC 0809 is 0 10V.
Tachogenerator is to measure voltage.
LM35 is unable to measure negative temperature.
The sensitivity of thermocouple is high.
Accelerometer is used for measurement of pressure.
GSM modem is interfaced to the 8051 with its on-chip serial port.
Q.2
What is matrix keyboard?
05
Describe in brief serial port of 8051 in different modes.
05
Write a note on thermister.
04
Q.3
Explain the addressing modes of 8051 and working of on-chip port-0 of 8051.
10
Discuss the classification of instruction set of 8051.
04
Q.4
What is an Interfacing? Explain interfacing of DAC with 8051 and write an ALP to generate triangular wave using the same.
10
Write necessary ALP to read key code from it.
04
Page 2 of 2
SLR-UH-297
Q.5
With help of a diagram, explain interfacing of LCD with 8051.
Write a program to display the "SOLAPUR UNIVERSITY, SOLAPUR"
10
Explain how to measure current with 8051.
04
Q.6
With a good sketch, explain interfacing of Humidity sensor with 8051.
10
Explain how accelerometer can be interfaced with 8051.
04
Q.7
With neat diagram, explain interfacing of GSM module with 8051.
10
What is PS-2 keyboard?
04