CHETTINAD COLLEGE OF ENGINEERING AND TECHNOLOGY COMMUNICATION ENGINEERING REG 2008 TWO MARKS QUESTION AND ANSWERS

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1 CHETTINAD COLLEGE OF ENGINEERING AND TECHNOLOGY B.E.,/B.TECH., ELECTRONICS EC6504 MICROPROCESSORS & MICRO CONTROLLERS COMMUNICATION ENGINEERING REG 2008 TWO MARKS QUESTION AND ANSWERS UNIT 1 AND 2 CS SUBJECT : EC 2304/Microprocessor And Microcontroller TYPE : University Question paper 2marks with answer 1. Define instruction cycle and machine cycle. The total time required to complete the execution of a single instruction is known as the instruction cycle. It is defined as the time required to complete one operation such as, op code fetch, memory read & write, I/O read write, ack cycle. 2. Give the format of flag register in S Z X AC X P X CY S-sign flag, Z-zero flag, X-not use, AC-auxiliary carry flag, P-parity flag, CY-carry flag. 3. Discuss the terms 2 key lockout, N-key Rollover.

2 2 key lockout: In this mode, simultaneous key depression is not allowed. When any key is depressed, the debounce logic is set and 8279 checks for any other key depress during next two scans. N key rollover: Here, each key depressed independently from all others. 4. Give the control word format of x x x D3 D2 D1 D0 0-bit reset, D0(1 for set, 2 for reset) 5. What is Try-state devices. Try state devices those are can be exhibit a high impedance state with 0 and 1. This can be help in bus oriented devices where ports of many chips will have to be used. 6. Mention the advantages of using the direct memory access(dma). DMA allows a peripheral device to read from / write to memory without going through the CPU. DMA allows for faster processing since the processor can be working on something else while the peripheral device can be populating memory. 7. What is purpose of following (a) AAD. (b) RCL.

3 AAD: ASCII Adjust for division instruction adjusts the unpacked BCD divided in AX be fore a division operation. RCL: Rotate through carry left ins rotates the contents left through carry by the specified number of bits in count operand. 8. Write an 8086 assembly language program to multiply two 16bit unsigned numbers to provide a 32 bit result. Assume that the two numbers are stored in CX and DX. CODE SEGMENT ASSUME CS: Code MOVE AX, DX MULCX HLT CODE ENDS END 9. When the 8086 processor is in minimum mode and maximum mode? The logical level at this pin decides whether the processor it to operate either max or min. If logic 1 mode is min. if logic 0 mode is max. 10. Define segment override prefix. mov AX,[ES:60126] ; use ES as the segment mov AX,[CS:bx] ; use CS as the segment mov AX,[SS:bp+si+3] ;use SS as the segment

4 11. What are the 8086 instruction used for BCD arithmetic? DAA Decimal adjust accumulator DAS Decimal adjust after subtraction 12. List any four programs control instruction available in JAJNBE- jump if above / jump if not below or not equal JEJZ- Jump if equal / jump if zero flag JO- jump If overflow flag=1 JS- jump if sign flag=1 13. What is Microprocessor.diff b/w CPU and µp? µp is a multipurpose programmable device that reads binary instruction from a storage device called memory, it accepts binary data as i/p and process the data according to those instruction and provides results as o/p. CPU consists of ALU and control unit. 14. Why the program counter and the stack pointer are registers of 16bit? Program counter is 16bit because it points to the 16bit memory address. Stack pointer to a memory location in R/W memory called the stack. 15. What is an assembler Directives? Give two Examples. Assembler directives help the assembler to0 correctly understand the assembly language programs to prepare codes. Examples : DW,ASSUME,EQU,DB

5 16. List any two external hardware synchronization instruction of 8086 µp. LOCK WAIT 17. What is meant by minimum mode system configuration in8086 microprocessor? The µp 8086 is operated in minimum mode by connecting its MN/MX pin to logic 1. The minimum mode system uses only one processor. Mention different data transfer schemes? 1.Parallel data transfer a. Programmed I/O b. Interrupt I/O 1. Serial data transfer 18. What is assembler? An assembler is a program used to convert an assembly language program into the equivalent machine code modules which may further be converted to executable code. 19. What is purpose of LEA instruction in 8086? The load effective address instruction loads the offset of an operand in the specified register. Example: LEA BX, ADR 20. How clock signal is generated in 8086 µp? The 8086 does not have a internal clock circuit. The 8086 requires an external asymmetric clock source with 331 duty cycle. The 8284 clock generator is used to generate the required clock for 8086.

6 21. State the function of queue status QS0 and QS1 in 8086? QS0 QS1 Indication 0 0 No operation st byte of opcode from queue 1 0 Empty queue 1 1 Subsequent byte from queue. 22. How will carry and zero flags reflect the result of the instruction CMP BX, CX? CMP BX, CX Condition Zero flag Carry flag CX>BX 0 0 CX=BX 1 0 CX<BX Give any four miscellaneous instruction in 16bit microprocessor? INTO- interrupt overflow TRET- interrupt return HLT- halt suspend the program LOCK- lock the buses. PREPARED BY. Department of Electronics And Communication Engineering ::::::: King Ece :::::::

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