6 06000EC305122002 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: EC305
Course Name: MICROPROCESSORS & MICROCONTROLLERS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) What are T states, machine cycles and instruction cycles in 8085? (5)

b) Different control and status signals are there in 8085. Which are they? Explain (5)
each.

c) What are the functions of the following instructions in an 8085 assembly (5)
language program?

1) ^^ ^ 10) ^^ iii) LDAXR, ൧൮.൦ iv) EI
2 a) Witha neat diagram, explain the architecture of 8085. (10)

b) Which IC can be used as an interface for 8085 if data is to be transmitted and (5)
received serially? Explain the transmitter and receiver section of that interface.

3 a) What are the operations performed by 8085 while executing the instruction (8)
OUT 0111? Explain with a neat timing diagram. What is the time taken to
execute this instruction if the frequency of clock connected with 8085 is
2MHz?

b) Draw and explain 8085 programming model and hardware model. What is the (7)
difference between the two?
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.

4 a) Why 8086 architecture has different segments? Explain each segment in 8086 (19)
and show how physical address is generated in each.

0) Explain power down and idle mode in 8051. How can they be enabled and (5)
disabled.

5 ஐ ‘Explain register relative addressing mode and relative based indexed mode in (5)

8086 with at least two examples.

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