Download GTU B.Tech 2020 Winter 7th Sem 2173203 Microprocessor And Microcontroller Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

1. (a) Write an AVR C program to get a byte of data from Port C. If it is less than 100, send it to Port B; otherwise, send it to Port D. 03
   (b) Explain and Draw the control signal generation in 8085 Microprocessor. 04
   

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   (c) List out the addressing modes for the AVR Controller and explain any two of them. 07
2. (a) Write an AVR C program to toggle all the pins of Port B continuously by Using the Ex-OR operator. 03
   (b) Explain Flag register PSW of 8085 Microprocessor. 04
   (c) Write a program to toggle all the bits of the I/O register PORT D every 2 s. Assume that the crystal frequency is 8MHz and system is using an ATmega32. 07
3. (a) Explain AVR status register in detail. 03
   

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   (b) A switch is connected to pin-PB5. Write a program to monitor the status of the SW and perform the following. 04
   1. If SW =0, send the letter ‘B’ to PORT C.
   2. If SW =1, send the letter ‘Y’ to PORT C.
   (c) Explain architecture of the 8051 microcontroller. 07
4. (a) With Fosc:=8 MHz, Find the UBRR value needed to have the following baud rates. 03
   1. 9600
   2. 4800

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   (b) List out features of RISC and give comparison between RISC & CISC processors. 04
   (c) Explain the Pin Diagram of the 8085 microprocessor. 07
5. (a) Explain Logical Instruction with example for the AVR Controller. 03
   (b) Design 16*8 register using 4*8 register chips for the microprocessor 8085. 04
   (c) Write a C program to toggle only the PORT B.4 bit continuously every 70 µs. Use Timer 0, Normal mode and 1:8 prescaler to create the delay. Assume XTAL=8MHz. 07

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7. (a) Write down different steps in executing an Interrupt. 03
   (b) Write a Program to (a) load the PORT B register with value 0x55, and (b) Complement PORT B 300 times. 04
   (c) With diagram explain architecture of AVR microcontroller and also draw and explain the Harvard architecture in the AVR. 07
8. (a) Explain criteria for choosing a microcontroller. 03
   

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   (b) Draw and explain TIFR register in AVR. 04
   (c) Explain interfacing of LCD with AVR using program to display “GOOD LUCK” on LCD for AVR controller. 07
9. (a) Write a short note on AVR Family. 03
   (b) Write a program to transmit the message “YES” serially at 9600 baud, 8 bit data and 1 stop bit. Do this forever. 04
   (c) Draw & Explain the RTC interfacing diagram with AVR Microcontroller. 07

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