Microprocessors and Interfacng. Question bank

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1 Microprocessors & Interfacing 8086 ARCHITECTURE: UNIT-I Functional Diagram, Register Organization, Addressing modes, Instructions, Functional schematic, Minimum and Maximum mode operations of 8086, 8086 Control signal interfacing, Timing Diagrams. 1. a) Explain the physical address formation in b) Explain the function of the following signals of (i) ALE, (ii) TEST, (iii) HOLD, (iv) NMI, (v) BHE, (vi) DT / R, (vii) READY, (viii) DEN April (a) Describe the functions of the following pins of 8086 i. NMI ii. ALE iii. S2, S1, S0 iv. Test v. READY (b) Discuss about any three arithmetic instructions of [10+6] All Sets Dec Distinguish between the terms microprocessor, microcomputer and micro controller. Write about the evolution of microprocessor. 2. With a neat architectural diagram, explain the functioning of an Explain, why 8086 internal architecture is divided into BIU and EU? Discuss the A-bus, B-bus and C-bus and their use. Nov/Dec Discuss briefly about pre-fetch queue in April Discuss the functions of all general purpose registers of 8086.Explain the special function of each register and instruction support for these functions. Explain the function of following registers 8086 microprocessor. a) AX,BX,CX,DX b) CS,DS,SS, ES c) BP,SP, SS, ES d) IP and instruction queue 5. What is memory segmentation? Explain the use of segmentation in different applications. Explain how segmentation provides effective task switching mechanism. Aug Give the 16-bit flag register format of 8086 and explain about each flag in detail. Nov-03,Jun Write detail about the addressing modes of 8086 microprocessor. Apil Explain detail about the following addressing modes of 8086 with examples. ((i) I/O addressing (ii) Based indexed addressing with displacement. 9. Explain the meaning of the following 8086 instructions, (i) MOV [3845h],bx (ii) ADD AX, [SI] (iii) MOV BX,2956h (iv) ADC ax,bx Explain the following 8086 instructions with examples (i) MUL (ii) IMUL (iii) DIV (iv) IDIV. Aug Describe the function of the following pins and their use in 8086 based system. (i)nmi (ii) LOCK (iii) TEST (iv) RESET. April Describe the function of the following pins in8086 maximum mode of operation (i) TEST (ii) RQ/GT 0 and RQ/GT 1 (iii) QS0 and QS1 (iv) s0, s1, s2 Nov What is the purpose of ALE, BHE, DT/R and DEN pins of 8086? Show their timing in the system bus cycle of Aug-07, April With appropriate pin diagrams explain the minimum and maximum mode operations of With a neat pin diagram explain the maximum mode operation of 8086.

2 Show the circuit required to generate the upper and lower I/O strobes in minimum and maximum modes of operation of Aug-07,April Distinguish between a memory read and write machine cycle. Draw the timing diagrams in minimum and maximum modes f operation.. UNIT II INSTRUCTION SET & ASSEMBLY LANGUAGE PROGRAMMMING OF 8086 Instructionset formats, addressing modes, instruction set, assembler directives, macros, simple programs involving logical, branch and call instructions, sorting, evaluating arithmetic expressions, string manipulations. 1. (a) What are assembler Directives? Explain 4 assembler directives in detail? (b) Write an ALP to find the multiplication of two 16-bit Hex numbers? [10+6] All Sets Dec (a) Explain briey the execution of all the instruction of 8086 with suitable examples. (b) Explain briey the addressing modes for control transfer instructions. [10+6] All Sets May (a) Write an 8086 progress to perform the addition of two matrices. (b) Write a program to arrange a string of numbers in descending order. [10+6] All Sets May Discuss the assembler directives with examples. Aug-07,April Develop an assembly language program to multiply two BCD numbers of 2-digits each. April Explain with an example, how a far procedure is declared as PUBLIC? Show how an external near procedure is called in main program? Aug-07, April What is a procedure? Give an example to declare a procedure as near. Make this procedure as PUBLIC procedure. Aug-07, April What are the different ways of passing parameters to and from procedures? Explain the methods with examples in assembly language. Aug Develop a PUBLIC procedure to convert 4-digi Hex to BCD number and return the value. April Differentiae between procedures and macros using certain examples. Aug-08, April Give the assembly language implementation of the following, (i) DO-WHILE (ii) FOR.August Discuss various branch instructions of 8086 microprocessor, that are useful for relocation. April- 07,April-06, April What are the loop instructions of 8086? Explain the use of DF flag in the executin of string instructions. Aug-06, Nov-05,May Write an ALP in 8086 to move block of N bytes of data from source to destination.,aug Write an ALP in 8086 to add 5 bytes of data in an array by making use of procedure., Aug Write an ALP in 8086 to add two 16-bit hexa decimal numbers.,aug Write an ALP in 8086 to find a maximum number in the array of 10 numbers.,aug- 08,April Write a recursive program in 8086 ALP to find the sum f the first n-integers.,aug- 08,April Write a program in 8086 to ad two 8-bytes of data available in memory location array1 and array2. Store the result in aray Write an ALP to count number of 0s in a 16 bit binary string.

3 18. Write an ALP in 8086 to add two 16 digit packed BCD numbers.,april Write an ALP in 8086 to divide a 32-bit number by a 16-bit number., April Write an ALP in 8086 to display the string WELCOME on the screen. Aug Write an ALP in 8086 to count number of positive and negative numbers from an array of 8-bit integers. Aug-08, April Write an ALP in 8086 to exchange a block of N bytes of data between source and destination. Aug- 08,April-08. I/O INTERFACE UNIT-III 8255 PPI, Various modes of operations and interface of I/O devices to 8086, Interfacing keyboard, display, stepper motor interfacinga/d, D/A Converter Interfacing. 1. (a) Explain the basic steps involved in an A/D converter (b) Explain the pin Diagram of ADC 0808/0809 All Sets May Draw the block diagram of 8255 and explain each block. April Describe the three modes of operations for 8255 using relevant diagrams. Aug-08 Explain mode 1 input operation and mode 1 output operation in 8255 with examples. Aug Distinguish between a system clock and peripheral clock and explain briefly the control block of What is meant by Interfacing? Explain the brief description of PPI. Aug What is BSR mode of operation? How it is useful in controlling the interrupt initiated data transfer for mod1 and mode2? Aug-08, April-07, Aug Distinguish between mode set control word and BSR control word f April- 08, 09,Aug-08. Discuss about the following control words of (i) Mode set control word (ii) Bit set/reset control word. 8. Write the necessary instruction sequence to initialize 8255 with address 0C00H to 0C03H for the following combinations. (i) Port A as input and ports B and C as output in ode 0 operation. (ii) Port A in mode 1 operation and port B in mode 0 operation Aug Supose that the beginning address of an 8255 is 0900H and write a program sequence that wil, (i) Put bot groups A and B in mode 0 with orts A and C being input ports and port B as an output port. (ii) Put group A in mode 1 with port A being an input and PC6 and PC7 being outputs and group B in mod 1 with ort B being an input. April 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 1 msec delay between set and reset of bit 3 of port C. April Explain the transistor buffer circuit used to drive 7 segment LEDs April-07, Aug Interface a stepper motor to the 8086 microprocessor system and write an 8086 assembly language program to control the stepper motor. 13. Explain about interfacing of a DAC with 8086 using April Explain how an AD can be interfaced to a microprocessor. Give the required instruction sequence to acquire one sample from ADC. 15. Write an ALP in8086 to generate a symmetrical square wave form with 1 khz frequency. Gie the necessary circuit setup with a DAC.,Aug08, April Interface a 12-bit DAC to 8255 with an address map of 0C00H to 0C03H. the DAC provides output in the rang of +5 V to -5V write the instruction sequence. (a) For generating a square wave with a peak to eak voltage of 4 V and the frequency will be selected from memory location F (b) For generating a triangular wave with a maximum voltage of +3 and a minimum of 2V. Aug-07,April- 06,Nov-05,April-05.

4 UNIT-IV INTERFACING WITH ADVANCED DEVICES. Memory Interfacing to 8086,interrupt structure of 8086, vector interrupt table, interrupt service routing, Introduction to DOS and BIOS interrupts, Interfacing Interrupt Controller 8259, DMA controller 8257 to (a) Explain the intialiazation sequence of (b) Write about the command words of [8+8] All Sets May 10 2.(a) Explain the bus structure of 8086 system (b) Explain the fundamental concepts of DRAM controller. [8+8] All Sets Dec Explain briefly about memory interfacing with 8086 microprocessor.,aug-08. Explain how static RAM are interfaced to Give necessary interface diagram assuming appropriate signals and memory size. Aug-08,April-08. With neat sketch explain the internal organization of SRAM chip. List out the input and output pins Discuss their function in a system. Aug-07. With the help of basic cell explain SRAM and DRAM. discuss the advantages of the memories. April-07, Nov-05, April Draw the basic cell structure of EPROM and explain the principle of operation. April-07, Aug-06. Distinguish between EPROM and E2PROM. Mention their application areas. Aug-07, April Differentiate between static and dynamic RAMs give some example. April Explain the need for DMA in microprocessor based systems.. Explain need of DMA. Discuss in detail about DMA transfer method. Aug-08,April-08. Explain demand transfer mode and block transfer mode of Aug-07, April Show how 8237 s are cascaded to provide more number of DRQ s and explain the operation. Aug- 07,April With a neat block diagram explain the working of 8237 DMA controller, Aug-07, April- 06. With a neat block diagram, explain the working of 8257controller., Aug Give the priority of 8086 interrupts, hardware and software. Explain why single step interrupt is having lower priority. Aug Discuss the sequence of operations performed in the interrupt acknowledge cycle. Aug What is the difference between maskable and non-maskable interrupts. Give some examples. April- 09, Aug Discuss the following i) single step execution ii) Interrupt n overflow. April Discuss about DOS and Bios interrupts. Give necessary examples. April Describe the operation of 8279 with a neat block diagram PIC architecture and interfacing, cascading of interrupt controller and its importance. Aug- 07 a) Distinguish between master and slave mode operation of b) Give an interfacing diagram, b) which shows the connections between 8086 and 8259., April-08

5 13. Differentiate between initialization command words and operation command words of April- 09. How many initialization command words are required for a single 8259 in an 8086 based system? Explain their format. April Describe some important features of 8259 interrupt controller. 15. Explain the importance of 8259 interrupt controller and explain how does it handle the interrupt. April-08 COMMUNICATION INTERFACE UNIT-V Serial Communication Standards, serial data transfer schemes, 8251USART Interfacing RS-232, IEEE-488, 20mA Current Loop, Prototyping and Trouble shooting, Software Debugging tolls, MDS. 1. (a) Explain why serial data transfer is mostly preferred over parallel data transfer. Give reasons. (b) Distinguish between data formats used for Synchronous and Asynchronous serial data transfer modes. [8+8] All Sets Dec 10 2.(a) Write the sequence of events for 8251 initialization with necessary 8086 instructions. (b) Draw and explain the block diagram of [8+8 ] All Sets May (a) Explain about the programmed I / O. (b) Explain about the interrupt driven I / O. [8+8] All Sets Dec10 1. Discuss the types of serial communication. April -09 Distinguish between synchronous and asynchronous serial data transmission techniques. Discuss the advantages and disadvantages. April-07, 2. Discuss the data transmission standards and their specifications. Aug Draw the flow chart showing how synchronous serial data can be sent from a port line using software routine. Aug A terminal is transmitting asynchronous serial data at 2400bd. What is the bit time? Assuming 7 data bits, a parity bit and 1 stop bit how long does it take to transmit one character? April Draw the block diagram of 8251 and explain abut each block. Aug-08, April Give the status register of 8251 and explain each bit. April What are the important features of 8251? May Explain the following control words of 8251 with suitable examples, i) Mode word ii) Command word. May Explain the interfacing of 8251 with 8086 with necessary circuit diagram. 10. Explain about the three errors in asynchronous serial transmission. Sep Write the instruction sequence to re-initialize the above 8251 in synchronous mode with even parity, single SYNC character and 8-bit character size. May What is the difference between 20mA current loop and RS232-C standard. Aug Give the specifications of RS-232C. May-08, May Draw the circuit of RS-232 to TTL conversion and explain this interface. Sep Draw the circuit of TTL to RS232 and explain the necessity of this interface. Aug Explain about line driver and line receiver used in serial communication. May-08 UNIT-VII INTRODUCTION TO MICRO CONTROLLERS Overview of 8051 Micro Controller, Architecture, I/O ports and Memory Organization, Addressing

6 modes and Instruction set of 8051, Simple Programs. 1. (a) Explain the logical instructions of 8051 with examples (b) Write 8051 program to multiply the unsigned number in register R2 by the unsigned number on port 2 and put the result in external RAM locations 1000H (MSB) and 1001H (LSB). [8+8] All Sets Dec Enrich salient features of 8051 family of microcontrollers. April-07,April Draw the architectural diagram of 8051 microcontroller and explain in detail about each block. 3. Discuss about various addressing modes of Aug Draw and discuss the formats and bit definitions of the following SFR s in 8051 microcontroller. i) PCON ii) PSW iii) IP iv) TMOD. Aug Discuss the register set of MCS-51 family of microcontrollers.nov Draw and discuss the formats and bit definitions of TCOM SFR in 8051 microcontroller. Nov Explain with waveforms, the different modes of counter/timer in Discuss in detail about parallel I/O ports in 8051 microcontroller. Also explain how these ports are accessible for specific applications. 9. Explain the interrupt structure of Aug Discuss in detail about memory and I/O interfacing of Aug How does 8051 differentiate between the external and internal program memory? Sep Interface 8255 I/O ports with The address of port A should be 0000h. Aug Draw the oscillator circuit and also draw the 8051 timing diagram. 14. Discuss in detail about parallel I/O ports in 8051 micro controller and explain how these ports are accessible for specific applications 8051 REAL TIME CONTROL: UNIT-VIII Interrupts, Timer/Counter and Serial Communication, Programming Timer Interrupts, Programming External H/W interrupts, Programming the serial communication interrupts, Interrupt Priority in the 8051, Programming 8051 Timers, Counters 1. (a) Explain serial data interrupts, data transmission and data reception in 8051? (b) Give the format of SCON register in 8051 and explain each bit. [8+8] All Sets May Explain how serial data communication is done with 8051 serial ports. Apr/May Explain with waveforms, different modes of serial data transmission modes in8051. Apr/May What is the use of Mode 0 of serial communication in Write a program to transmit a data 45H in mode 0. Apr/May What are the various SFRs you need while handling the Timers/Counters. Give the register formats. Apr/May (a) Explain how the timer flag interrupt and the serial port interrupt are generated. (b) Discuss on external interrupts? (c) Discuss on interrupt priority? Apr/May Write 8051 program to initialize timer 1 in mode 0. Apr/May Give the formats of the registers which are used for the counters/timers. Apr/May Write 8051 program to generate 2 khz square waves on pin P1.0 of port 1 using Timer interrupt. Aug Write 8051 program to receive a serial byte through RxD. Aug Give the sequence of events that takes place when the interrupt occurs in Aug Draw the bit formats of IE and IP registers of 8051? Aug Discuss in detail about serial port operation in 8051 microcontroller. Aug Discuss about various modes of operations of timer in Aug Write 8051 program as an example of interrupt call to a routine, timer 0 is used in mode 0 to overflow and set the timer 0 interrupt flag. When the interrupt is generated, the program vectors to

7 the interrupt routine, resets the timer 0 interrupt flag, stops the timer,and returns. Aug Discuss the bit format of IP register of 8051? Aug Explain with waveforms different modes of counter/timer in 8051? Aug-2008

Code No: Set No. 1

Code No: Set No. 1 Code No: 2320404 Set No. 1 1. a) Draw the architectural diagram of 8085 and explain the function of each block in detail b) Discuss about Multiplexing in 8086 microprocessor [10+6] 2. a) Explain in detail