APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY Previous Years Question Paper & Answer

Course : B.Tech

Semester : SEMESTER 5

Year : 2018

Term : DECEMBER

Scheme : 2015 Full Time

Course Code : EC 305

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

Course Code: 5
Course Name: MICROPROCESSOR & MICROCONTROLLERS
Max. Marks: 100 Duration: 3 Hours

PART A
Answer any two full questions, each carries 15 marks. Marks
1 a) Draw the architectural diagram of 8085 microprocessor and explain (10)

b) Explain the comparative features of memory mapped I/O and I/O mapped I/O ( 5)
interfacings to 8085 microprocessor along with its proper control signals required.

2 a) Draw and explain the timing diagram of MVI B, data. If the clock frequency is 6 (10) MHz, how
much time is required for the execution of this instruction?

b) Explain the purpose of the following signals in 8085 (i) READY (ii) ADO-AD7 (5)
(iii) HOLD (iv) IO/ M (v) INTR

3 a) Give the advantage of using 8279 for keyboard/display interface? What arescan (10) 14105
used for? Explain (i) Encoded Scan Mode and (ii) Decoded scan mode

b) Draw and explain the schematic of latching low-order address bus in 8085 (5)
microprocessor.

PART B
Answer any two full questions, each carries 15 marks.
4 98) Anarray of 10 numbers is stored in the internal data RAM starting from location (10) 30 H.
Write an assembly language program to sort the array in ascending order starting from location 40
H.

b) What are different segments of memory with which 8086 can work? List the (5 )
advantages of segmented memory. How is physical address determined from an offset
address?

5 9) Explain the following instructions: (5)

MOV A, 1

MOVC A, @A+DPTR

MOVX A, @DPTR

DJNZ RO, BACK DAA

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