ANNA UNIVERSITY :: CHENNAI - 600 025
MODEL QUESTION PAPER(V-SEMESTER)
B.E. ELECTRONICS AND COMMUNICATION ENGINEERING
EC331 - MICROPROCESSOR AND ITS APPLICATIONS
Answer all Questions
PART - A (10 x 2 = 20 Marks)
State the function of HOLD pin in 8085.
Write 8085 assembly language instructions to store the contents of
the Flag Register in memory location 2000H.
Explain DJNZ instructions of Intel 8031 Micro controller.
Determine the contents of the accumulator after the execution of
the following program segments
MOV A,# 3CH
State the function of Direction flag in 8086
Describe the difference between the instructions MOV AX, 2437H and
MOV AX, [2437H]
How does Port C of 8255 differ from ports A and B.
Explain the function of in-service register in 8259 programmable
Draw a circuit to interface a stepper motor winding to a microprocessor
port bit using power MOSFET
Why Gray code is used in Shaft angle encoder.
PART - B (5 x 16 = 80 Marks)
11.a) Draw the
circuit diagram of an 8085 system having a 4 KB EPROM and 8 KB RAM ICs. The starting
address of the EPROM is 0000H and that of RAM is 8000H. The address decoder circuits
should be clearly shown.
Write a subprogram using 8085 assembly language to multiply two 8 bit binary
numbers by repeated addition.
12.a)i) Determine the value of the accumulator after
the execution of instructions A:,B:, C: and D:
MOV 40H , #88H
MOV R0 , #40H
MOV A , R0
MOV A, @R0
MOV A, 40H
MOV A, #40H
ii) With neat diagram explain the timer / counter
functions in 8051 Micro Controller.
12.b) Using ports
P0 and P1 of 8051 micro controller design an 8 digit 7 segment
multiplexed display system. Use suitable driver circuit and give flowchart for the
13.a)i) With neat diagram explain how the memory
is interfaced to 8086 as odd and even page.
ii) Write an 8086 subroutine to test
a system in address 00200H- 07FFFH.
in detail the memory management functions in Intel 80286/80386 Processor
14.a) With block
diagram describe the working of a DMA controller.
With a neat diagram describe how the DAC 1408 can be interfaced to the micro controller
8031.Using this hardware write 8031 assembly language to generate
a Triangular wave.
Using DC servomotor and shaft angle encoder as sensor design a Microprocessor based
position control system.
how a closed loop microprocessor based process control system can be implemented
by using digital PID control algorithm.