Micro Processor 2

541 B. E. (Computer Science Engg.) Vth Semester Examination MICROPROCESSORS Paper-EE-309_C Time allowed: 3 hours Maximum Marks: 100 Note: Attempt any five questions. 1.

With the help of a block diagram explain in detail the architecture of 8085 microprocessor.

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2. (a) Differentiate between 'machine language' and 'assembly language'. (b) Write an assembly language program for 8085 JlP to find the smaIfest ~kment in a block of 8~bit unsigned bin~ata, whose number is stored in memory locatiorJ

ACOIH, and the data are stored in memory locations I

beginning from AC02H. Store the smallest number in rnemorylocation FFOOH. 5,15 3, Give architecture block diagram of 8086 JlP and explain clearly EU, BIU and various registers. 4.

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ror 8086 JlP (a) Determine the memory address accessed by the

instruction MOV [Sl + 1001-11. EAX

.

Given DS = 1200, B. BX = 0100H, and Sf = 0250H (b) Find the address of the next instruction (0 be fetched if fP

= lAOOH and CS = 2000B. 541-1 ,300-P2-(Q-8) (03)

PT.O.

5.

(2)

(c) Obtain the current address of the stack if 55 = 2400 and SP = AOOOH. 5. (a) Draw a block diagram of 8255 PPI and give the';s functional description of each block. "~ (b) What are the various modes of operation of 8255 PPI? Explain briefly. 6.

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What is meant by DMA operation? Discuss the operation of 8257 programmable DMA controller.

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7. (a) Discuss the hardware interrupt structures of 8085 and 8086 microprocessors. (b) Explain clearly the necessity of the 8259 PIC. 8.

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Write short notes on any three of the following: (a) Shift and Rotate instructions (b) Stack and stack pointer

(c) Flags of 8085 IlP (d) Programmable Interval Timer.

541-" i.300

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