GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2151707 Date:27/11/2018Subject Name:Microcontroller & Interfacing (IC)
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) How will interpreter differ than compiler? Explain it briefly 03
(b) Explain working of ALU + Control unit + ext memory of 8085 04
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(c) Draw and describe Timing diagram for execution of MOV B,25H 07 instruction for 8085 operation with each t-state Q.2 (a) Draw DIP-8051 Intel architecture of micro-controller by giving 03 each pin name
(b) Describe with schematic of clock circuit and reset circuit of 8051 04
(c) Justify the need of logical instruction in microcontroller. Explain 07 ANL, RRC, SWAP and DA instructions.
OR
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(c) Describe each bit of PSW Register operation. How you represent 07 negative numbers? Give its brief notes.
Q.3 (a) Why Port 0 required pull up register? Give its technical 03 justification in operation of microcontroller
(b) Write an 8051 C program to convert packed BCD 0x29 to ASCII 04 and display the bytes on P1 and P2.
(c) Prepare Assembly language program’ (ALP) Assume that RAM 07 locations 20 — 24H have the following values. Write a program to find the sum of the values using ADDC. At the end of the program, register A should contain the low byte and R7 the high byte. 20 = (7D), 21 = (EB).22 = (€5),23 = (5B), 24 = (30)
OR
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Q.3 (a) What is Pointer? ‘How many pointers are available in 8051 03 microcontroller? Describe its working briefly.
(b) Write an 8051°C program to get a byte of data form PO. If it is 04 less than. 100, send it to P1; otherwise, send it to P2.
(c) Write a program to get the value from ADC by Port P1 multiply it 07 with 04H and send it to LED display by Port P2, Continuously.
Q.4 (a) What are directives of assembly language? Describe each of all 03
(b) Prepare Assembly language program (ALP) to generate 50 milisec 04 time delays using 11.0592MHz clock.
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(c) Draw and describe schematic of memory interfacing 16K x 8 bit 07 RAM, 16K x 8 bit ROM and 16K x 8 bit Program ROM with 8051(8031).OR
Q.4 (a) Is special function register SBUF bit addressable? Briefly explain 03 its working in connection of microcontroller data communication
(b) Draw and explain each bit of SCON and PCON registers. 04
(c) Assume that the 8051 serial port is connected to the COM port of 07 IBM PC, and on the PC, we are using the terminal.exe program to send and receive data serially. P1 and P2 of the 8051 are connected to LEDs and switches, respectively. Write an 8051 program to (a) send to PC the message “We Are Ready”, (b) receive any data send by PC and put it on LEDs connected to P1, and (c) get data on switches connected to P2 and send it to PC serially. The program should perform part (a) once, but parts (b) and (c) continuously, use 4800 baud rate
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Q.5 (a) Draw TCON and IE Register and describe each bit, 03
(b) Explain edge trigger interrupt INTO and INT1 activation. 04
(c) Draw and describe schematic of ADC0804 interfacing with 8051. 07
OR
Q.5 (a) Explain MOVX and MOV C instruction. 03
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(b) Prepare ALP to generate PWM signal to control speed of DC 04 motor.(c) Draw and describe with ALP to run Variable reluctance Stepper 07 motor with 30 degree step.
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