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Posted By: newbie Member Level: Platinum Posted Date: 23 Jun 2008
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2008 III B.Tech II Semester Regular Examinations, Apr/May 2008 MICROPROCESSORS AND INTERFACING Question paper
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Code No: R05320404
Set No. 4
III B.Tech II Semester Regular Examinations, Apr/May 2008
MICROPROCESSORS AND INTERFACING
( Common to Electronics & Communication Engineering, Electronics &
Instrumentation Engineering, Bio-Medical Engineering, Electronics &
Control Engineering and Electronics & Telematics)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. (a) Explain the functioning of following resisters of 8086 Microprocessor
i. Segment resisters
ii. Pointer resisters
iii. Index resisters
(b) Discuss brie?y about pre-fetch queue in 8086
2. (a) Describe the following addressing modes with some examples.
i. Indexed addressing with displacement
ii. I/O port addressing
(b) Explain the meaning of the following 8086 instructions
i. mov [3845h], bx
ii. add ax, [si]
iii. mov bx, 2956h
iv. adc ax, bx
3. (a) Write an ALP in 8086 to add two 16-digit packed BCD numbers
[12+4]
[8+8]
(b) Write an ALP in 8086 to divide a 32-bit number by a 16-bit number [8+8]
4. (a) With relevant pin diagrams explain the minimum and maximum mode oper-
ations of 8086
(b) Explain brie?y about DMA data transfer method.
[12+4]
5. (a) Write the BSR control word to set bit 3 of port C and also write the BSR
control word to reset bit 3 of port C. Introduce a 1m sec delay between set
and reset of bit 3 of port C.
(b) Brie?y explain the application examples of mode 0, mode 1 and mode 2 of
8255.
[8+8]
6. (a) Explain the importance of 8259 interrupt controller and explain how does it
handle the interrupt.
(b) Give an interfacing diagram, which shows the connections between 8086 and
8259.
[10+6]
1 of 2
Code No: R05320404
7. (a) Discuss the types of serial communication?
Set No. 4
(b) Write an 8086 instruction sequence for receiving 50 characters using 8251 and
store them in memory at location 2080H..
8. (a) Discuss in detail about serial port operation in 8051 microcontroller.
(b) Explain in detail about the interrupt structure of 8051.
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