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Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

Course Code: EC305
Course Name: MICROPROCESSOR AND MICROCONTROLLERS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Define machine cycle and instruction cycle (5)
b) Draw and Explain 8085 Architecture (10)

2 a) Illustrate with relevant timing diagram, the sequence of operations involved in (10)
8085 for fetching and Executing the instruction MVI A, 0811 from external
memory location 200511 and 200611 (Assume that Opcode for 3۷۸۷۱ ‏ذ۸‎ is DE)

b) Draw the bit pattern for 8085 flag register (5)

3 ൮ Bring out the significance of control and status signals with reference to various (7.5)

operations of 8085 microprocessor

b) Explain the addressing modes of 8085 with examples (7.5)
PART 13
Answer any two full questions, each carries 15 marks.
4 a) Draw and Explain 8051 Architecture (10 )
b) Draw the bit pattern for 8051 flag register (PSW) (5)
5 9) Explain the addressing modes of 8051 with examples (7.5)
b) Write an 8051 assembly language program to add two 32 bit numbers (7.5)
6 a) Draw and Explain the memory organization of 8051 (7.5)
b) Explain the classification of 8051 instruction set with examples (7.5)
PART C
Answer any two full questions, each carries 20 marks.
7 a) Explain TMOD SFR ( Special Function Register) (5)
b) Explain TCON SER ( Special Function Register) (5)

c) Write an assembly language program in 8051 to toggle bit 11.5 continuously (10)
every 50ms. Use timer 0, Mode 1 to create the delay. (assume that XTAL = 12
MHZ)

8 a) What is the difference between edge triggered and level triggered interrupts (5)

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