III B.Tech II Semester(R05) Supplementary Examinations, December 2010 MICROPROCESSORS AND MICROCONTROLLERS (Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. The register contents of 8086 is given below. CS=4000H, DS=B000H, SS=C000H, ES=7000H, SI=2000H, DI=3000H, BP=1000H, SP=0002H, AX=0000H, BX=5200H, CX=8000H, DX=2800H Calculate the effective address and physical address of the following instructions. (a) (b) (c) (d) (e) (f) (g) (h)
2. Develop an 8086 assembly language program that reads a key from the keyboard and converts it to uppercase before displaying it. The program needs to terminate on typing the ‘Crtl + C’ key combination. [16] 3. Distinguish between a memory read and write machine cycle? Draw the timing diagrams in minimum and maximum modes of operation? [8+8] 4. Write the necessary instruction sequence to initialize 8255 with address 0C00H to 0C03H for the following combinations. (a) Port A as input port in mode 1 and port B as input port in mode 1 without the interrupt driven i/o. (b) Port A in mode 2 as output port and port B as input port in mode 0 with interrupt driven i/o. (c) Port A in mode 0, port c upper half as input ports and port B as input port in mode 1 with interrupt driven i/o. (d) Port A as output port in mode 1 with active interrupt, port B as input port in mode 0 and port C lower half as output port in mode 0. [4 x 4 =16] 5. (a) How do we connect RS-232C equipment i. To data terminal type devices? ii. To serial port of SDK -86, RS-232C connection? (b) Give the specifications of RS-232C.
[5+5+6]
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) Design the required logic to generate read, write control signals for memory and I/O in a target system using 8086 microprocessor? Generate bank select signals for even and odd address memory banks? (b) With the help of basic cell explain SRAM and DRAM? Discuss the advantages and disadvantages of the above memories? [8+8] 8. (a) Enlist salient features of 8051 family of microcontrollers? (b) Explain with waveforms different modes of counter/timer in 8051? ?????
(a) How do we connect RS-232C equipment. i. To data terminal type devices? ii. To serial port of SDK -86, RS-232C connection? (b) Give the specifications of ...
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ELECTRO MECHANICS - I. Electrical And Electronics Engineering. Time: 3 hours Max Marks: 80. Answer any FIVE Questions. All Questions carry equal marks ?
(a) What is the significance of microbial classification? Describe the classification of Carl- Wooese et al. (b) Describe different taxonomic ranks in microbiology with special reference to bacteria. 3. (a) Write briefly on nutritional classes of mic
