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06000CS305122001

Answer any two full questions, each carries 9 marks.
Design an interface between 8086 microprocessor and two 4K x 8 EPROM

and two 4K x8 RAM memory modules. The RAM address must start at
000001.
Discuss about the steps followed by 8086 when it detects an interrupt signal
in the INTR pin.
Discuss the predefined interrupts in 8086
Draw and explain the architecture of a Programmable Interrupt Controller.
Determine the value to be loaded in control word register of 8255 if it has to
be interfaced with 8086 in such a way that ports A & B are to be configured
as input ports and port C is to be configured as output port? All ports are
assumed to be in mode 0.
PART E

Answer any four full questions, each carries 10 marks.

How does a microcontroller differ from a microprocessor?

Discuss about different factors which decide the selection of a
microcontroller for a specific application.
“8051 has bit addressable and byte addressable registers.”

i) What is the difference between the above two types of registers?

ii) Classify the following 8051 registers into bit-addressable or byte-
addressable groups: Registers are A, 70, 21, SP

How do the stack operations of 8051 differ from that of 8086?

Explain the functions of the following components of 8051 microcontroller:

(i) Processor Status Word 0) DPTR

Write short note on interrupt structure of 8051 microcontroller

What is meant by addressing mode of an instruction? Discuss about any three
addressing modes supported by 8051 microcontrollers.
What will be the effect of execution of each of the following 8051

instructions if register A contains the value 89H?

(i) CPL A (ii) RL A (iii) SWAP A
Write an 8051 assembly language program to check whether an 8 bit number
stored in internal memory 5FH is a power of 2. If the number is a power of 2
write FFH in register RO.

What is the need of 8254 chip? Explain any two modes of operation of 8254.

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