Seat No.: ________ Enrolment No.
___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER– IV(NEW) EXAMINATION – SUMMER 2023
Subject Code:3141008 Date:17-07-2023
Subject Name:Microprocessor & Microcontroller
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
Q.1 (a) Write the conditions when Parity flag, Zero flag and Sign flag will be set and reset in 8085. 03
(b) What is the size of stack pointer and program counter in 8085? Explain their functions also. 04
(c) Explain the function of following pins of 8085. 07
1. TRAP 2. SOD 3. HLDA 4. READY
Q.2 (a) Explain (1) LDS (2) STS instruction with the help of an example. 03
(b) Draw and explain Data memory space of AVR with no extended I/O memory. 04
(c) List down criteria for choosing a microcontroller to use it in any electronics circuits and 07
system.
OR
(c) Assume that R20 has packed BCD.Write a program to convert the packed BCD to two 07
ASCII numbers and place them in R21 and R22.
Q.3 (a) Write down the conditions when Negative flag and Overflow flag will be set and reset in 03
AVR.
(b) Explain the function of DDRx,PORTx and PINx registers in AVR. 04
(c) Write a program to find number of 1s in a given byte. 07
OR
Q.3 (a) What is branch penalty and its role in AVR? 03
(b) Specify the reasons for writing program in C language instead of assembly language. 04
(c) List down logical instructions used in AVR and explain any 4 of them with an example. 07
Q.4 (a) List down sources of interrupts in the AVR. 03
(b) Explain function of each bit of TCCR0 (Timer/Counter Control Register). 04
(c) Explain following instructions with an example. 07
1.SWAP 2.ASR 3.ROL 4.LSR
OR
Q.4 (a) Discuss the function of X, Y and Z register in AVR? 03
(b) Write a AVR C program to toggle only bit 4 of PORT C continuously without disturbing 04
the rest of pins of PORT B.
(c) Write down steps to program Timer 2 in normal mode. 07
Q.5 (a) Find the value for TCCR1A and TCCR1B to program Timer 1 as Normal mode and the 03
OC1A generator as square wave generator and no prescaler.
(b) List down the registers associated with USART and explain the role of each register in 04
brief.
(c) Write down steps to program A/D Converter using polling. 07
OR
Q.5 (a) Explain with neat diagram, stepper motor interfacing with AVR 03
(b) Give the name and functions of register used for SPI Protocol. 04
(c) List down features of I2C protocol and explain any two in details. 07
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