Embedded System Question Paper - May 18 - Diploma In Electronics Engineering (Semester 6) - Maharashtra State Board of Technical Education (MSBTE)

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Embedded System - S18

Diploma in Electronics Engineering (Semester 6)

Total marks: 100
Total time: 3 Hours

INSTRUCTIONS
(1) All Questions are compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.

Attempt any THREE :

1.a.i Draw internal RAM organisation of 89C51 microcontroller. Explain register banks in it.

(4 marks) 8927

1.a.ii State the function of simulator, linker compiler and debugger.

(4 marks) 8936

1.a.iii Describe parallel communication protocols.

(4 marks) 8968

1.a.iv Draw a labelled interfacing diagram of ADC 0808 with 8951 microcontroller.

(4 marks) 8986

Attempt any ONE :

1.b.i Classify embedded system. Describe any two of them in short.

(6 marks) 9010

1.b.ii Explain pre-emptive scheduling and round-robin scheduling algorithms in RTOS.

(6 marks) 9023

Attempt any FOUR :

2.a Compare RISC and CISC architectures with any four points.

(4 marks) 8928

2.b Explain the use of assembly language in C language with suitable example.

(4 marks) 8937

2.c Draw a labelled interconnection diagram between RS232 and 8951 microcontroller.

(4 marks) 8969

2.d A 230 V AC bulb is connected through a relay at P2.2. A light sensor is connected at P3.4. A light sensor produces logic high in dark condition. Write a ‘C’ program to switch ‘ON’ the bulb in ‘DARK’ condition and switch it OFF in ‘LIGHT’ condition.

(4 marks) 8987

2.e Describe intertask communication in RTOS.

(4 marks) 9024

2.f Draw and explain block diagram of embedded system.

(4 marks) 9011

Attempt any FOUR :

3.a List wireless communication protocols and state four features of zigbee protocol.

(4 marks) 8970

3.b Write a ‘C’ program to toggle P2.1 continuously with 100 ms delay. (Use simple delay subroutine).

(4 marks) 8938

3.c Compare desktop operating system with RTOS with any four points.

(4 marks) 9025

3.d State any two advantages and disadvantages of embedded system.

(4 marks) 9012

3.e Draw a labelled interfacing diagram of DAC 0808 with 8951 microcontroller. Also write a ‘C’ program to generate triangular waveform using DAC.

(4 marks) 8988

Attempt any THREE :

4.a.i Draw format of TMOD register. Find the value of TMOD register to operate timer 0 in mode 1.

(4 marks) 8929

4.a.ii Explain CAN Bus protocol with the frame structure.

(4 marks) 8971

4.a.iii State any eight design metrics of embedded system.

(4 marks) 9014

4.a.iv Explain the concept of deadlock with suitable example.

(4 marks) 9026

Attempt any ONE :

4.b.i Write a ‘C’ program to generate a square wave of 5 kHz. (Operate timer 0 in mode 1).

(6 marks) 8939

4.b.ii Draw labelled interfacing diagram of stepper motor with 8951. Write a ‘C’ program to rotate it in counterclockwise direction.

(6 marks) 8989

Attempt any FOUR :

5.a State ‘C’ language logical operators for AND, OR, NOT and EX-OR operation. Give one example of each.

(4 marks) 8940

5.b Distinguish between synchronous and asynchronous communication with any four points.

(4 marks) 8972

5.c State number of portlines required for a keyboard matrix having following keys:

(i) 16

(ii) 256

(iii) 64

(iv) 144

(4 marks) 8990

5.d State four key specifications of RTOS.

(4 marks) 9034

5.e Describe in-circuit emulator.

(4 marks) 8941

5.f Draw labeled interfacing diagram of 4 × 4 matrix keypad with 8951.

(4 marks) 8991

Attempt any FOUR :

6.a Distinguish between assembly language and C language with reference to:

(i) Ease of programming

(ii) Memory requirement

(iii) Coding time

(iv) Execution time

(4 marks) 8942

6.b Draw pin diagram of DB9 connector, stating function of each pin.

(4 marks) 8973

6.c Draw labelled interfacing diagram of 16 × 2 LCD with 8951 and state function of RS and R/W pin.

(4 marks) 8992

6.d A key is connected at P3.2 and 8 LEDs are connected to P$_{1}$ of 8951. Write a ‘C’ program to display 0 to 255 in binary on LEDs, when a key is pressed.

(4 marks) 8993

6.e Manipulate the following table for data types used in ‘C’ language.

Sr. No.	Data type	Bit size	Data range
1	Unsigned char	?	?
2	Signed int	?	?
3	Sbit	?	?
4	Sfr	?	?

(4 marks) 8943

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