GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2151707 Date: 06/06/2019
Subject Name: Microcontroller & Interfacing (IC)
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019Subject Code: 2151707 Date: 06/06/2019
Subject Name: Microcontroller & Interfacing (IC)
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- ALP means Assembly Language Program
| MARKS | ||
|---|---|---|
| Q.1 (a) | Briefly write the differences between MOV & MVI instruction in 8085 operation. | 03 |
| (b) | Explain with neat sketch the role of ALE pin of 8085. | 04 |
| (c) | Explain with diagram how 4 bit register store data using RD, WR and enable signal. | 07 |
| Q.2 (a) | Describe Memory addressing modes of 8051 microcontroller | 03 |
| (b) | What is Special Function Registers? Describe the working of PWS with bit addressable mode. | 04 |
| (c) | Prepare ALP (Assembly Language Program) to ADD 8 consecutive following RAM addresses and store the results in appropriate registers. 70= 11H, 71= FEH, 72= BBH, 73= 44H, 74=55H, 75=66H, 76=FA, 77=BFH. Use only iteration (loop) method. | 07 |
| OR | ||
| (c) | Prepare ALP to add (1F1C) and (BBC3) two 16-bit numbers. Place the sum in R7 and R6; R6 should have the lower byte. | 07 |
| Q.3 (a) | Add two signed numbers (-49D) to (-72D) and store the result in register R7. State bit condition of PSW register before and after this addition | 03 |
| (b) | Write an 8051 C program to Blink LED 90 times. LED should be connected to Port 1. pin no.2. | 04 |
| (c) | Prepare ALP to read the weight of the object and sort out it for the value 0f 77:-According to sorting results, place the object whose value into-specific registers indicated by the following. --- Content provided by FirstRanker.com --- If W=77 then A=77If W < 77 then R1 =W If W > 77 then R2 =W | 07 |
| OR | ||
| Q.3 (a) | Discuss the importance of the need of DATA POINTER in 8051 microcontroller application.. | 03 |
| (b) | Prepare ALP to find no. of 1 in given byte= BA and store no. of 1 in R4. | 04 |
| (c) | Make appropriate control word in TMOD register so Timer1 will work as counter 1 in mode 2. Prepare ALP to count the pulses and display the status of the TL1 count on P1, which connects to single 7-segment displays. | 07 |
| Q.4 (a) | Explain execution of PUSH and POP Instruction. | 03 |
| (b) | Explain the function of each bits of TMOD and TCON Timer | 04 |
| (c) | Prepare Assembly language program (ALP) to generate 1 sec time delay. Use crystal frequency=11.0592MHz | 07 |
| OR | ||
| Q.4 (a) | Discuss in brief the operation of ACALL, LCALL instruction of 8051 microcontroller. | 03 |
| (b) | Describe the function of Pin no. 29, 30 and 31 of DIP 8051 Microcontroller. | 04 |
| (c) | Prepare ALP to send the message “WELCOME TO THE COLLEGE?” to serial port. Assume a SW is connected to pin P1.2. Monitor its status and set the baud rate as follows: SW =0, 4800 baud rate SW =1, 9600 baud rate --- Content provided by FirstRanker.com --- Assume XTAL = 11.0592 MHz, 8-bit data, and 1 stop bit. | 07 |
| Q.5 (a) | Draw and describe interfacing of mircocontroller to 4Kx8 bit memory chip using 74LS138. | 03 |
| (b) | Explain with neat sketch the timing diagram of LCD interfacing with 8051. | 04 |
| (c) | Give brief explaination of ADC signal conditioning and interfacing of LM35 sensor with 8051 microcontroller. | 07 |
| OR | ||
| Q.5 (a) | Write down excitation sequences of stepper motor to run it in clockwise and counter clockwise direction | 03 |
| (b) | Prepare ALP to generate PWM signal using timer mode-2 for speed control of DC motor. | 04 |
| (c) | Write a C program that continuously gets a single bit of data from P1.5 and sends it to P1.2, while simultaneously creating a square wave of 50 ps period on pin P2.5. Use Timer 1 to create the square wave. Assume that XTAL = 11.0592 MHz: | 07 |
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