GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Code: 2151001
BE - SEMESTER-V (NEW) EXAMINATION — WINTER 2018
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Subject Name: Microcontroller and Interfacing (EC)
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | Discuss criterion to select microcontroller. | 03 |
| (b) | Explain conditional branch instructions BREQ and BRNE with examples. Write an AVR ALP to toggle PA0 pin 100 times using conditional branch instruction. | 04 | |
| (c) | Discuss SPI bus protocol with reference to AVR microcontroller. | 07 | |
| Q.2 | (a) | Write an AVR ALP to find number of 0s in 0x99. | 03 |
| (b) | Explain the functions of following pins: 1. TCK 2. RXD 3. AREF 4. RESET. | 04 | |
| (c) | What are the serial interrupts available in AVR microcontroller? Write interrupt routine to receive data through serial port (RxD) pin and display data on PORTB. Initialize serial port registers and enable serial port interrupts in main program. | 07 | |
| OR | |||
| (c) | Write an AVR C program to convert (1) packed BCD 0x29 to ASCII and display the bytes on PORT B and PORT C (2) ASCII digits of ‘4’ and ‘7’ to packed BCD and display them on PORT B. | 07 | |
| Q.3 | (a) | Write an AVR ALP to load I/O register of Port B with the value 0x55 and complement I/O register of Port B 10 times. | 03 |
| (b) | Explain usage of AVR status register. | 04 | |
| (c) | Explain with diagram, DC motor interfacing with AVR. | 07 | |
| OR | |||
| (c) | Write an AVR C program to toggle all the bits of Port B 100 times. | 07 | |
| Q.4 | (a) | What is need of RTC? Explain interfacing of RTC with AVR microcontroller. | 03 |
| (b) | Draw Interfacing diagram to interface LCD with AVR Microcontroller. Use Port D to drive data lines. Connect RS pin of LCD with PA0 and Enable pin with PA1. Ground R/W pin of LCD. | 04 | |
| (c) | Compare: CISC and RISC architecture. | 07 | |
| Q.5 | (a) | List different shift and rotate instructions and explain any two with proper example. | 03 |
| (b) | Write an AVR C program to generate square wave of 60% duty cycle on Port B.1 bit using Timer(0. Analyze the program. | 04 | |
| (c) | Discuss IC bus protocol with appropriate diagram. | 07 | |
| OR | |||
| Q.3 | (a) | Discuss the steps for execution of branch instruction in AVR | 03 |
| (b) | List addressing modes of AVR and explain any two with example. | 04 | |
| (c) | Write an AVR C program to generate square wave with a period of 12.5 microsecond on Port B.3 bit using Timer( in normal mode. Assume crystal frequency = 8 MHz. | 07 | |
| Q.4 | (a) | Explain Bitwise AND and Bitwise OR operators with example. | 03 |
| (b) | and quotient in R21 register. | 04 | |
| (c) | Explain Look-up table concept in AVR with example. | 07 | |
| OR | |||
| Q.5 | (a) | Compare: Macros and Subroutines. | 03 |
| (b) | Write an AVR ALP for multiplication of two 8 bit data. | 04 | |
| (c) | Discuss IC bus protocol with appropriate diagram. | 07 |
GUJARAT TECHNOLOGICAL UNIVERSITY
Date: 20/11/2018
Total Marks: 70
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