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Code No: 37302 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV.B.TECH - I SEMESTER REGULAR EXAMINATIONS NOV/DEC, 2009 MICRO CONTROLLERS AND APPLICATIONS (Common to ECE, BME, ETM) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1. a) Compare and contrast the architecture of a general purpose microprocessor and a microcontroller. b) Draw a neat diagram of internal register set, special function register and program status word structure and their use in 8051. [8+8]

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2. a) Explain the following instructions of 8051. i) SJMP ii) AJMP iii) LJMP iv) MOVC A@A+DPTR v) XHG vi) SRL vii) SETB viii) PUSH b) Write an assembly language program to reverse an array when source and destination array address is same. [8+8]

Explain the sequence of operation to handle time interrupts in 8051. Write a sequence of instructions to initialize interrupt structure of 8051. [16]

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4. a) Design timer as a band rate generator with crystal oscillator frequency of 12 MHz . b) Explain difficult control words in controlling the operation of timer/counters in 8051. [8+8] 5. a) What is meant by the term “ contact debounce” ? How is this taken care in the interface of keyboard to a microcontroller? b) Interface an LCD display unit to 8051 and write initialization code. [8+8] 6. a) Explain round robin and pre emptive scheduling algorithm with example. b) Describe the R to S function in RTX51 in RTX51 times. [8+8]

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7. a) Explain how a maskable interrupt source can be made a highest priority source in 80196? b) Explain the software timer interrupt in 80196? [8+8]

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8. a) Explain the complete ARM register set in different modes of ARM. b) What are the thumb version load-store multiple instruction? Explain them with example. [8+8]

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Code No: 37302 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV.B.TECH - I SEMESTER REGULAR EXAMINATIONS NOV/DEC, 2009 MICRO CONTROLLERS AND APPLICATIONS (Common to ECE, BME, ETM) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1. a) Explain the interrupt structure and interrupt handling mechanism in 8051? b) What is the importance of internal RAM of 8051. How is it organized? [8+8]

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2. a) Explain how a data is transferred from R0 to R7 of register bank 1 to R7 to R0 of register bank O . b) Explain different conditional and unconditional JMP instructions in 8051. [8+8]

3. a) Explain the format of IP and IE register of 8051. b) How does 8051 handle multiple interrupts which comes from different sources. Which of the interrupts to be enabled by the program after an interrupt is received on it. [8+8] 4. a) Explain in detail the mode 3 operations of timer/counter 8051. Use time 1 in mode 3 as a band rate generator. b) Explain TCON and TMOD register formats of 8051. [8+8] Interface an 8*8 matrix keyboard to 8051 using 8279. Display the key number on the 7 segment display unit. Which is interface to same 8051 through same 8279? [16]

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Explain the terms “Task create” , “ deletion” , “waiting for signal”, “ waiting for semaphore” , “ waiting for message” and “ sending signals “ in RTx51. [16]

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7. a) What is a high speed input (HSI) interrupt ? Why do we call it high speed in 80196. b) What are the uses of the bits in interrupt pending register? How do we use these for the interrupts servicing of timer1 and timer 2 of 80196. [16]

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8. a) What are the various processor modes of ARM? What is their order of privilege? Explain? b) Explain the pipeline executing characteristics of ARM? c) What are the various condition flags in ARM [5+5+6] ****

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Code No: 37302 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV.B.TECH - I SEMESTER REGULAR EXAMINATIONS NOV/DEC, 2009 MICRO CONTROLLERS AND APPLICATIONS (Common to ECE, BME, ETM) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

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1. a) How does a programmer access the internal and external memory ( both data and code) of 8051 ? Explain with an example. b) What is the need for a timer in a microcomputer? How is it used in 8051 system? [8+8] 2. a) Generate a square wave of 50% duty cycle on bit 4 of port1 of 8051. b) Write a brief note on addressing modes in 8051. Explain them for data transfer instructions. [8+8]

3. a) Explain the advantages and disadvantages of vectored interrupts and polled interrupts. b) How can 8051 handle multiple interrupts which may occur simultaneously. [8+8]

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4. a) Write a delay routine using timer 0 in mode 2 to generate a pulse cycle of 2500Hz on pin 2.7. b) Explain how timer\counter can be used as event counter. [8+8]

5. a) Describe IEEE 488 bus signals and timings. b) Explain the working of an opto isolator? Give the interface circuit for this isolator at port pin of 8051. [8+8] Explain the basic architecture of a Kernel what are the kernel object ? With the help of a state diagram , explain difficult task states. [16]

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7. a) List maskable and non-maskable interrupts in 80196 b) What are the various special function registers of 80196. How does a 26 byte address accommodates more than 26 special function register bytes? [8+8] 8. a) What are the various multiple register transfer instructions on ARM7? What are its addressing mode. b) Explain ARM geneic architecture. [8+8] ****

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Code No: 37302 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV.B.TECH - I SEMESTER REGULAR EXAMINATIONS NOV/DEC, 2009 MICRO CONTROLLERS AND APPLICATIONS (Common to ECE, BME, ETM) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

With the help of a neat block diagrams, explain the architecture feature of 8051 in detail. [8+8] 2. a) Explain difficult branch instructions available in 8051. b) Write an assembly language program to move an array of data from internal RAM to external RAM. [8+8] 3. a) b)

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Explain how 8051 are save multiple interrupts that occur simultaneously. differentiate between RET and RETI / IRET instructions. [8+8]

4. a) Design timer 1 in auto reload mode to generate a ON and OFF delay 10Sec each. The crystal frequency is 16 MHz. b) What is the basic difference between a timer and a counter? [8+8]

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5. a) Describe a thermocouple interface. b) How can one use the incremental shaft angle encoder to measure the motor speed every second. [8+8] 6. a) How can a semaphore handle a critical section of a task ? b) When do we use ‘ signal ‘ and when a ‘semaphore’ to inflow the RTOS to let another task unlock? [8+8] Draw 80196 vertical windows. What are it’s uses and what are its advantages [16] 8. a) Explain SWI and BIC instructions of ARM b) What is meant by thumb state and ARM state? What are the advantages and disadvantages with Thumb state. [8+8] ****

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