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Posted By: cdteja Member Level: Silver Posted Date: 28 Nov 2007
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2007 Jawaharlal Nehru Technological University jntu Question paper
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Code No: NR310501 NR
III B.Tech I Semester Supplementary Examinations, November 2005
INTERFACING THROUGH MICROPROCESSORS
( Common to Computer Science & Engineering, Information Technology
and Computer Science & Systems Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What are the control flags in 8086? Explain each of the control flags in con-
junction with the instructions being used.
(b) What are the advantages of memory segmentation?
(c) Explain the function of ALE pin in 8086. [6+4+6]
2. Develop an 8086 assembly language program that reads a key from the keyboard
and converts it to uppercase before displaying it. The program need to terminate,
on typing the control C key. 16]
3. (a) How is the LOCAL directive used within a macro sequence ? Explain with an
example.
(b) Develop a macro called ADD32 that adds the 32-bit contents of DX-CX to
the 32-bit contents of BX-AX. [8+8]
4. (a) Why are memory address decoders important ?
(b) Modify the NANP gate decoder CKt. So that it selects the memory for address
range 40000 H ....... 407FFH. [6+10]
5. (a) What is minimum no. of bus cycles that can occur between the time an
interrupt request is recognized and the first instruction in the interrupt routine
is fetched. Draw the bys cycles.
(b) Write an instruction sequence that will cause the priority of an 8259, whose
even address is
08A0, to be IR4, IR5, IR6, IR7, IR0, IR1, IR2, IR3. Solve this twice, once
assuming that the
highest priority is currently IR0 and once assuming that it is IR3. [6+10]
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. (a) Explain the working principle of a shaft encoder and give two applications.
(b) Explain how Stepper Motor controller can be connected to Microprocessor.
[6+10]
1 of 2
Code No: NR310501 NR
8. (a) Assume the 7-bit ASCII Code, even parity and 2 stop bits and sketch the
timing diagram of the letter ‘C’ as it is transmitted over an asynchronous
serial communication link.
(b) Give overview of RS-232C serial data standard. [8+8]
? ? ? ? ?
2 of 2
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