00000EC305121902

Pages: 2

Reg No.: Name:

Max. Marks: 100

1 a)
b)
2 a)
b)
3 a)
b)
4 a)
b)
5 ஐ
b)
6 a)
b)

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth semester B.Tech degree examinations (S) September 2020

Course Code: EC305
Course Name: MICROPROCESSOR & MICROCONTROLLER

PARTA

Answer any two full questions, each carries 15 marks.
Draw the architecture of 8085 and describe the functions of blocks.
Describe the method of separating the lower order address and data lines from
ADO-AD7 of 8085 with block schematic and timing diagrams.
List and explain the addressing modes of 8085 with 2 instructions in each mode
with syntax and purpose of instruction as examples.
Draw the structure and describe the significance of each bit in the flag register of
8085.
Draw the functional block diagram of 8255 and explain the preferable mode (any
one) of operation with control word register for interfacing 8 LEDs in port A
pins.
Describe the functions of SO, 51 and IO/M signals related to the various
operations of 8085.

PART B

Answer any two full questions, each carries 15 marks.
Illustrate the important functional units of 8086.
Draw the memory map of 8051. Explain the internal RAM organization and
functions of SFRs related to Timer.
Classify the instructions of 8051 according to their functions and write at least 2
instructions with description in each group as examples.
Write an ALP to add two 8 bit numbers which are stored in the memory locations
4500 & 4501H. Result (carry, sum) should be stored in the locations 4502 &
4503H respectively.
Differentiate between Microprocessors and Microcontrollers.

List the pin/signals of 8051 and describe the functions of any 8 important signals.

Duration: 3 Hours

Marks

(7)

(8)

(10)

(5)

(8)

(7)

(5)
(10)

(8)

(7)

(4)
(4)