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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: EE309
Course Name: MICROPROCESSOR AND EMBEDDED SYSTEMS (EE)
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carriesS marks

Discuss about various Bit handling instructions of 8051. (5)
Draw the TMOD register of 8051. Indicate which mode and which timer are (5) selected
for each of the following
i) MOV TMOD, #01H ii) MOV TMOD, #20H 11) MOV TMOD, #12H
8 Assume that bit P2.3 is an input and represents the condition of an oven. If it (5) goes high,
it means that the oven is hot. Monitor the bit continuously. Whenever it goes high, send a
high-to-low pulse to port P1.5 to turn on a buzzer.
PART 8
Answer any two full questions, each carries 10 marks.
9 With a neat block diagram explain the internal architecture of 8085 (10)
microprocessor.
10 a) Write a program to sort an array of 10 numbers in ascending order. (6) b) Define
instruction cycle and machine cycle. (4)
11 Draw and explain the timing diagram for the instruction MOV C, A (opcode: (10) 4111),
stored in location 6000H.

1 With examples explain the addressing modes of 8085. (5)

2 Explain the PUSH and POP instructions of 8085 with example. (5)
3 How the interrupts of 8085 can be classified? (5)

4 Compare microprocessor and microcontroller. (5)

5 Explain PSW of 8051. (5)

6

7

PARTC
Answer any two full questions, each carries 10 marks
12 a) Draw the control word format for the I/O mode of 8255. (4) b) Draw a neat circuit to
interface 8 switches and 8 LEDs with 8085. Program port (6) A (0011) as input and port B
(0111) as output. Write a program to read continuously from port A and display at port B.
13 a) Interface one 2Kx8 EPROM and 11658 RAM. Use 3 to 8 decoder. Write the (6) address
range of each memory chip.
b) What are the use of software tools for the development of an embedded system (4) 14

With a neat diagram explain water fall model. What are its disadvantages? (10)
PART D
Answer any two full questions, each carries 10 marks

15 a) Draw the detailed architecture of 8051 microcontroller. (6) b) Explain the
assembler directives of 8051. (4)

16 What are the different addressing modes of 8051 microcontroller? Explain each (10) with
suitable examples.

17 Explain DAC interfacing with 8051 and write an ALP to generate asaw tooth (10)
waveform.

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