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Posted Date: 29 Mar 2008 Posted By: Nitin Member Level: Platinum
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2007 Jawaharlal Nehru Technological University B.Tech MICROPROCESSORS AND MICROCONTROLLERS (Instrumentation & Control Engineering) - Set 2 Question paper
III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 MICROPROCESSORS AND MICROCONTROLLERS (Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
1. (a) Give the 8085 compatible ?ags of 8086 processors? Discuss the design of each ?ag? (b) List out segmentation resisters of 8086? Explain how 8086 provides 1 MB memory address space using the segment registers? What is the purpose of extra segment? [8+8] .
2. (a) Develop an assembly language program to multiply two BCD numbers of 2digits each? (b) Develop a PUBLIC procedure to convert 4-digit Hex to BCD number and return the value? [7+9]
3. Describe the function of the following pins and their use in 8086 based system. (a) NMI (b) LOCK (c) T EST (d) RESET [4 x 4 = 16]
4. Interface a 12-bit DAC to 8255 with an address map of 0C00H to 0C03H. The DAC provides output in the range of +5V to -5V. Write the instruction sequence. (a) For generating a square wave with a peak to peak voltage of 4V and the frequency will be selected from memory location âFâ. (b) For generating a triangular wave with a maximum voltage of +3V and a minimum of -2V. [6+10]
5. (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 necessary circuit to interface 8251 to an 8086 based system with an address 0C0H. Write the sequence of instructions to initialize 8251 for synchronous transmission? (Assume the necessary data) [8+8]
6. (a) What are the ?ve types of interrupts supported by 8086? (b) Write about interrupt vectors? How many bytes of memory does an interrupt vector requires? (c) Address 000E0H in the interrupt vector table contains 4132H and address 000E2H contains 0040H. i. To what interrupt type do these locations correspond? ii. What is the starting address for the interrupt service routine?[9+3+2+2]
7. In an SDK-86 kit 64KB SRAM and 32KB EPROM is provided on system and provision for expansion of another 64KB SRAM is given. The on system SRAM address map is from 00000H to 0FFFFH and that of EPROM is from F8000H to FFFFFH. The expansion slot address map is from 80000H to 8FFFFH. The size of SRAM chip is 32KB. EPROM chip size is 16KB. Give the complete memory interface and also the address map for individual chips? [16]
8. (a) Discuss the advantages of microcontroller based systems over microprocessor based systems? (b) With a neat sketch discuss the internal architecture of 8051?
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