GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-IV (NEW) EXAMINATION - WINTER 2020
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Subject Code:2140304 Date:11/02/2021
Subject Name:Microprocessor & its Interfacing
Time:02:30 PM TO 04:30 PM Total Marks:56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Explain rotate instruction with the help of figure. 03
(b) Define T-State, Machine cycle and Instruction cycle. 04
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(c) Explain 8085 addressing modes with help of example. 07
Q.2 (a) Explain function of following instruction in detail 03
1) DAD 2) DAA 3) XCHG
(b) Write an 8085 ALP to convert the hexadecimal value to decimal value? 04
(c) Draw and explain Architecture of 8085 07
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Q.3 (a) Write a program to find largest number in array of data. 03
(b) Compare Memory mapped I/O with Peripheral I/O 04
(c) Write a program to initiate ADC and store the digital data in memory. 07
Q.4 (a) Discuss the function of SIM and RIM instructions. 03
(b) Explain R/2R ladder network circuit used in D/A converter. 04
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(c) Write a program to multiply two 16-bit numbers and stored result in 07
memory location.
Q.5 (a) Explain the signals HOLD, READY and ALE. 03
(b) What is interrupt? List the interrupts available in 8085 Microprocessor 04
(c) With neat schematic explain working of 8253 Programmable timer 07
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Interface.
Q.6 (a) Explain Call and jump instruction in detail. 03
(b) Write an ALP for 8085 to find the square of the numbers from 0 to 9 04
using a Table of Square.
(c) With neat schematic explain working of 8259 Programmable Interrupt 07
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Controller.
Q.7 (a) Compare PUSH & POP instruction. 03
(b) Write a short note on serial communication protocols in detail 04
(c) Explain Mode 0, Mode 1 and Mode 2 operations of 8255 in detail. 07
Q.8 (a) Define 1) Opcode 2) Operand 3) Polling 03
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(b) Explain parallel communication protocols in detail 04
(c) Explain Interfacing of 4x 4 Matrix keyboard with 8085 in detail. 07
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