८ 06000CS305122001 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree (S,FE) Examination January 2022 (2015 Scheme)

Course Code: CS305
Course Name: MICROPROCESSORS AND MICROCONTROLLERS

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 3 marks. Marks
1 What is the importance of Bus High Enable signal of 8086? (3)
2 List out any 3 differences between 8086 and 8088 microprocessors. (3)
3 Differentiate between a macro call and a subroutine call. (3)
4 Assume the current value in register AX is FFFDH and carry flag value is 0.

What will be the new value in AX register after the execution of each of the

following 8086 instructions: (3)
(a)RCR AX, 01H (0) ROR AX, 01H (c)SHR AX , 01H
PART B
Answer any two full questions, each carries 9 marks.
5 Write an 8086 assembly language program to check whether a 16 bit number
a) stored at memory location 500AH : 2233H is divisible by 5. (5)
b) What are assembler directives? Define the functions of the following
assembler directives. (4)
(a) EQU ®) PTR
6 Draw the internal architecture of 8086 microprocessor and explain the (9)

functions of different blocks.

7 a) Draw and explain the flag register of 8086. (5)
b) Explain one method for resetting the TRAP flag of 8086. (4)
PART C
Answer all questions, each carries 3 marks.
8 Explain how 8086 computes the starting address of the ISR when it executes (3)

the instruction INT 21H.

9 Write short notes about the two hardware interrupt signals available in 8086. (3)
10 Differentiate I/O mapped and memory mapped interfacing concepts. (3)
11 What are the two priority schemes associated with 8257? (3)

PART D