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Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019
Course Code: EE309
Course Name: MICROPROCESSOR AND EMBEDDED SYSTEMS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries5 marks. Marks
1 Explain subroutine CALL and RET instructions in 8085 (5)
2 Explain the operation of following instructions (5)
(1) MVIC,05H (ii)INRH (iiiMMOV A,B (iv) CMA
Explain briefly the control word in 8255 PPI. (5)
4 Differentiate between hard & soft real time systems. (5)

Write the 8-bit PSW register in 8051. Explain how register banks are selected (5)

using PSW register.
6 Explain I/O ports and its functions in 8051. (5)
7 Write an ALP in 8051 to generate a square wave of 50% duty cycle on bit 0 of (5)
port 1 using Timer 0.
8 Find the values of TMOD registers to operate as timers in the following modes (5)
(i)Mode 1 Timer 1 (11) Mode 2 Timer 0
PART छ
Answer any twofull questions, each carries10 marks.
9 ച Explain addressing modes in 8085 with examples. (6)
b) Explain the function of following pins in 8085. (4)
(i)ALE (ii)TRAP
10 a) Draw the timing diagram of instruction STA 45000. (10)
11 a) Write an ALP in 8085 to find the largest number from an array of numbers. (6)
b) Explain Fetch cycle & Execute cycle in 8085. (4)
PART C
Answer any twofull questions, each carries10 marks.
12 a) Show how a DAC can be interfaced with 8085 Microprocessor. (7)
b) Explain software and hardware interrupts. (3)
13 a) Differentiate between Microprocessor and Microcontroller. (5)
0) List the field of applications for an embedded system. (5)

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