C5819 Pages: 2

Reg No.: Name:

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

Course Code: EC305
Course Name: MICROPROCESSOR & MICROCONTROLLERS (EC)

Max. Marks: 100 Duration: 3 Hours

PARTA
Answer any two full questions, each carries 15 marks Marks
a) The internal architecture of 8085 microprocessor has internal units capable to (8) execute a
program stored in external memory. Justify with relevant features and diagram.
b) Differentiate between register addressing and register indirect addressing in 8085 (4)
microprocessor and justify with sample instructions.
c) Identify the peripheral chip to interface 8085 microprocessor to communicate with (3) serial
1/0 devices and mention the different sections in the peripheral chip.
a) Illustrate with relevant timing diagram the sequence of operations involved for (7) fetching
and executing the instruction MVI C, 08H in 8085 microprocessor.
b) Bring out the significance of the signals SO, S1 and IO/ M with reference to (4) various
operations of 8085 microprocessor. −
c) Mention the addressing capability of 8085 microprocessor. Justify your answer . (4)
a) Suggest a suitable peripheralinterface to input the status of 4 switches(ON/OFF) (8) connected
to 8085 microprocessor and indicate their status by 4 LEDs connected to 8085. Illustrate the
above with schematic.
b) How many modes of operations are possible in 8253 interface IC? List out the (7) different
functions which can be achieved in those modes.

PART B
Answer any two full questions, each carries 15 marks

a) How does the internal architecture of 8086 microprocessor enable high speed (5) execution of
instruction?
b) Compare the features of 8086 processor and 80286 processor. (3)
c) Write an assembly language program for 8051 microcontroller to find out how (7)
many bytes are zeros out of 30 bytes stored in memory locations starting from RAM
location 45H.

5 a) Differentiate between microprocessorand microcontroller. (3)

b) Mention the specific features of 8051 microcontroller architecture. (4)

c) Compare the various addressing modes in 8051 microcontroller and illustrate with (8)
examples.

6 a) What is the type of memory architecture for 8051 microcontroller? Illustrate the (9)

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