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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 setno1 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) Develop an 8086 assembly language program that performs multiplication by
shift and add method.
(b) Develop an 8086 assembly language program that displays the largest of N
signed numbers. [8+8]
3. (a) Write short notes on the following string data transfer instructions :
i. LODS
ii. STOS
iii. MOVS
(b) Explain what the REPE prefix does when coupled with the SCASB instruction
? [12+4]
4. (a) What is the mode and I/O configuration for ports A,B and C of an 8255 after
its control register is loaded with 82H.
(b) What control word must be written in to the control register of the 8255 so
that Port A is configured for bidirectional operation and port B is set up with
mode 1 outputs
(c) In a maximum mode system, which device produces the input, output and
bus control Signals for the I/O interface. [6+6+4]
5. (a) Explain the functions of the following signals of 8257
i. IOR
ii. IOW
iii. HRQ
iv. MARK
v. MEMR
vi. MEMW
vii. TC
viii. AEN
(b) Explain the programming of channel prioriteis and auto load feature of 8275
DMA controller. [8+8]
6. (a) Design a circuit to activate a actuator, based on a bit combination given by
eight switches interfaced to a microprocessor
(b) Design a interface circuit to feed numbers 0-9 through a linearly encoded
switches and to display the number on a seven segment LED through a mi-
croprocessor [8+8]
7. Explain with a block diagram how a floppy disk drive is interfaced to the micro-
processor and explain the various control signals. [16]
8. (a) A terminal is transmitting asynchronous serial data at 1200 Bd. What is the
bit time? Assuming 8 data bits, a parity bit and 1 stop bit, How long does it
take to transmit one character?
(b) Draw the flow chart showing how asynchronous serial data can be sent from
a port line using a software routine.
(c) Why are the two ground pins on an RS-232C connector not just jumpered
together? [7+7+2]
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