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Posted Date: 01 Sep 2008 Posted By: gopal Member Level: Diamond
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2005 Jawaharlal Nehru Technological University Electrical and Electronics Engineering III B.Tech II Semester Supplementary Examinations, November/December 2005 MICROPROCESSORS AND INTERFACING Question paper
III B.Tech II Semester Supplementary Examinations,
November/December 2005
MICROPROCESSORS AND INTERFACING
( Common to Electrical & Electronic Engineering, Electronics &
Communication Engineering, Electronics & Instrumentation Engineering,
Bio-Medical Engineering, Electronics & Control Engineering and Electronics
& Telematics)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Discuss the general functions of all general-purpose resisters of 8086? Explain the
special function of each resister and instruction support for these functions. [16]
2. (a) What is a recursive procedure? Write a recursive procedure to calculate the
factorial of number N, where N is a two-digit Hex number?
(b) What are the loop instructions of 8086? Explain the use of DF flag in the
execution of string instructions. [9+7]
3. (a) What are the control signals useful for inter processor communication using
8086? What instruction set support is provided in 8086?
(b) Design an I/O port decoder that generate the following low-bank I/O strobes:
0010H, 0020H, 0030H, 0040H. [6+10]
4. Interface an 8-bit DAC to 8255 with an address map of 0100H to 0103H. The DAC
provides output in the range of +5V to -5V. Write the instruction sequence for the
following?
(a) For generating a square wave with a peak to peak voltage of 2V and the
frequency will be selected from memory location ‘FREQ’. [6+10]
(b) For generating a triangular wave with a maximum voltage of +4V and a
minimum of -2V.
5. Explain with a neat sketch all registers of 8237 and their use in DMA transfer?[16]
6. With detailed hardware and the associated algorithm, explain how a real time clock
will be implemented in an 8086 based system. [16]
7. A target system based on 8088 processor uses less amount of SRAM. The programs
are stored in EPROM that starts from F0000H ends with the address of FFFFFH.
The capacity of SRAM is 8KB interfaced at address 00000H. The chip size is 8KB
for EPROM and SRAM. Show the complete memory interface? [16]
8. (a) Draw and discuss the formats and bit definitions of the following SFRs in 8051
microcontroller?
i. SCON
ii. TCON [4x2=8]
(b) Discuss the following signal descriptions?
i. ALE/PROG
ii. EA/V
pp
iii. PSEN
iv. RXD
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