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Posted By: kondapalli Member Level: Gold Posted Date: 08 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering INTERFACING THROUGH MICROPROCESSORS setno3 Question paper
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1. (a) If an absolute address of the type 6A3D9H is given, express it in the form of
CS : IP and explain what are the advantages of the memory segmentation.
Discuss about the various segment registers in 8086.
(b) What are the modes in which the 8086 can be used .How many lines are there
in the multiplexed bus of 8086. Give the pin diagram separately for each mode
of operation. [8+8]
2. (a) Add two 5 byte numbers such that the sum is stored in one of the source array
locations.
(b) Write an 8086 ALP to convert the Fahrenheit temperature to Celsius temper-
ature. [8+8]
3. Develop an 8086 assembly language program that will determine if a given sub-
string is present or not is a main string of characters. Place the result as a ‘1’ if
present or as ‘0’ if not present in a memory location. [16]
4. Draw the schematic diagram of 8255 PPI and explain different modes of operation
of 8255 with example. [16]
5. (a) Explain organization of the 8259 programmable interrupt controller .
(b) With a neat diagram explain cascading of two 2 x 8259’s to interface 15 I/O
devices. [10+6]
6. Explain with a block diagram how 4-digit seven segment LEDs can be interfaced
to a microprocessor using multiplexing. [16]
7. Explain with a block diagram the working of 8272 floppy disk controller and discuss
its various commands. [16]
8. Explain the functions of the follwing system tools
(a) Assembler
(b) Linker
(c) Debugger and
(d) Locator [16]
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