M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Electronic Science
MICROCONTROLLERS AND INTERFACING
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right indicate full marks.
Q.1 Select the most correct alternative. 14
What is the address range of SFRs?
80h to feh 00h to ffh
80h to ffh 70h to 80h
Timer0 is a bit register.
32-bit 8-bit
16-bit 10-bit
How many interrupts are there in micro controller
3 6
4 5
External Access is used to permit
Peripherals Power supply
ALE Memory interfacing
Which pin provides a reset option in 8051?
Pin 1 Pin 8
Pin 11 Pin 9
What is order of the assembly and running 8051 program?
Myfile.asm ii) Myfile.lst iii) Myfile.obj iv) Myfile.hex
i,ii,iii,iv ii,iii,i,iv
iv,ii,i,iii iii,ii,i,iv
Auxiliary carry is set during which condition?
When carry is generated from D3 to D4.
When carry is generated from D7.
When carry is generated from both D3 to D4 and D7.
When carry is generated at either D3 to D4 or D7.
HY-HS 220 is
Temperature sensor Humidity sensor
Accelerometer Both b
Thermister is having
PTC NTC
Both b None of these
10) AD 595 is used for interfacing.
ADXL335 Thermister
Thermocouple All of these
11) PT100 is mostly used as
Temperature sensor Humidity sensor
Accelerometer Both b
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SLR-VH-235
12) PWM is technique used in motor interfacing to
High torque Speed variation
Both b None of these
13) ADXl335 is
Temperature sensor Humidity sensor
Accelerometer Both b
14) An LDR is made of a material.
Low resistance Moderate
High resistance None of these
Q.2 Answer any four of the following. 08
Define the role of PC (program counter) and SP (Stack Pointer).
Discuss bus concept of microcontroller.
What is opto-coupler?
What is meaning of signal conditioning.
Write about some of the LCD commands?
Answer any two of the following. 06
Discuss interrupts of 8051?
Discuss operation of seven segments along with its type.
Short note tachogenerator.
Q.3 Answer any two of the following. 08
Explain salient features of 8051.
What is LDR and its applications?
Short note servo motor:
Answer any one of the following. 06
Explain DAC interfacing with 8051.
Interface dc motor and switch to the 8051, control motor with interfaced
switch.
Q.4 Answer any two of the following. 10
Discuss the ports of 8051.
Explain the interfacing of HY- HS 220.
Explain in brief 16*2 LCD.
Answer any one of the following. 04
Find out execution time of following program if crystal of 11.0592 MHz?
DELAY: MOV R4, #200
HERE: NOP
NOP
DJNZ R4, HERE
RET
Write assembly or C program for blinking of LED which interfaced to
P1.3 of 8051.
Q.5 Answer any two of the following. 14
Describe pins of 8051 microcontroller.
Explain interfacing LM35 with 8051.
Discuss interfacing of RTC interfacing with microcontroller.