PESIT Bangalore South Campus Hosur road, 1km before Electronic City, Bengaluru -100 Department of Electronics and Communication

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1 USN 1 P E PESIT Bangalore South Campus Hosur road, 1km before Electronic City, Bengaluru -100 Department of Electronics and Communication INTERNAL ASSESSMENT TEST 1 Date : 26/02/2018 Marks: 40 Subject & Code : Microprocessor - 15EC42 and 10EC62 Sem & Sec: 5 th sem - C and parallel Name of faculty : Shwetha S Bhat Time : 11:30am -1:00pm Note: Answer FIVE full questions, selecting any ONE full question from each part. Marks PART 1 1 a With a neat diagram explain the internal architecture of 8086 Microprocessor 5 b Give a brief of all the registers of 8086 Microprocessor 3 OR 2 With example show how the following instructions are used: a.) AAM b.) AAD c.) PUSHF d.) LAHF 8 PART 2 3 a Write an ALP to implement DAS instruction 4 b If DS = AB04H, CS = 9960H, SS = 3B00H, BP = 7E74H, SP = 0135H, SI = 1245H, DI = 4356H, then determine physical address of the following instructions: 4 i) MOV [BP+DI+6], AH ii) ADD AL, [5036H] OR 4 a Explain memory organization of 8086 microprocessor 4 b Write an ALP to find 2 nd largest number in a series of five 8-bit numbers using procedures 4 PART 3 5 a Explain memory segmentation of 8086 microprocessor 4 b Evaluate the assembler instruction code for the following if the opcode of ADD is ADD 0FABE [BX] [DI], DX OR 6 Write an ALP to count the number of one s and zero s in a 16bit number using shift/rotate instruction 4 8

2 PART 4 7 a Write an ALP to generate 1 st - 10 numbers of a Fibonacci series and store them in 8 a memory location OR 8 a Write an ALP to find the LCM of two 8-bit numbers 8 PART 5 9 a Explain the different addressing modes in 8086 with example 8 OR 10 a Write and ALP to find the EVEN and ODD numbers in an array of five 16-bit numbers and store them in two different arrays in memory 8

3 P.E.S. Istitute of Technology( Bangalore South Campus) Hosur Road, ( 1Km Before Electronic City), Bangalore Department of Electronics and Communication SCHEME AND SOLUTION I INTERNAL TEST Faculty: Shwetha S Bhat Semester: 4 th sem C section Subject: Microprocessors Sub. Code: 15EC42 and 10EC62

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5 Q.No. Questions and its answers Marks 2 With example show how the following instructions are used: a) AAM : ASCII multiplication The aam instruction adjusts the result of a mul instruction Multiplication should not be performed on ASCII» Can be done on unpacked BCD The aam instruction works as follows AL is divided by 10 Quotient is stored in AH Remainder in AL aam does not work with imul instruction Example 1 mov AL,3 ; multiplier in unpacked BCD form mov BL,9 ; multiplicand in unpacked BCD form mul BL ; result 001BH is in AX aam ; AX := 0207H or AX,3030H ; AX := 3237H b) AAD : ASCII division The aad instruction adjusts the numerator in AX before dividing two unpacked decimal Numbers The denominator is a single unpacked byte The aad instruction works as follows Multiplies AH by 10 and adds it to AL and sets AH to 0 Example:» If AX is 0207H before Aad» AX is changed to 001BH after aad aad instruction reverses the changes done by aam Example: Divide 27 by 5 mov AX,0207H ; dividend in unpacked BCD form mov BL,05H ; divisor in unpacked BCD form aad ; AX := 001BH div BL ; AX := 0205H aad converts the unpacked BCD number in AX to binary form so that div can be used

6 c) PUSHF Push Flag Register Onto Stack Operation : flags register -> stack Description : For a word, SP - 2 and copies FLAGS to the new top of stack pointed to by SP. d) LAHF Load Register AH From Flags Copies bits 0-7 of the flags register into AH. This includes flags AF, CF, PF, SF and ZF other bits are undefined.

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9 4 b) Write an ALP to find 2 nd largest number is a series of five 8bit numbers using procedures.model SMALL.STACK.DATA NUM DB 06H,09H,08H,03H LEN DW $-NUM RES DB 00H.CODE MOV AX,@DATA MOV DS,AX LEA DI,NUM MOV SI,DI MOV CX,LEN DEC CX CALL LARGEST PUSH DI PUSH AX MOV [DI],00H MOV DI,NUM MOV SI,DI MOV CX,LEN DEC CX CALL LARGEST POP AX POP DI MOV [DI],AL MOV AH,4CH LARGEST PROC MOV AL,[SI] BACK:INC SI CMP AL,[SI] JNC NEXT MOV AL,[SI] MOV DI,SI NEXT:LOOP BACK RET LARGEST ENDP END

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12 6 Write an ALP to count the number of one s and zero s in a 16bit number using shift/rotate instruction CODE.MODEL SMALL.DATA M1 DB THE NUMBER OF LOGICAL ONES ARE:$ M2 DB THE NUMBER OF LOGICAL ZEROS ARE:$ M3 DB 00H,00H M4 DB ENTER THE NUMBER WHOSE ONES AND ZEROS ARE TO BE COUNTED:$ M5 DB 00H M6 DB 00H.CODE MOV AX,@DATA MOV DS,AX LEA SI,M3 LEA DX,M4 MOV AH,09H MOV CX,0002H UP:MOV AH,01H MOV [SI],AL INC SI LOOP UP MOV AH,00H MOV AL,M3(0) SUB AL,30H MOV BL,10H MUL BL MOV CL,M3(1) SUB CL,30H ADD AL,CL MOV CL,08H UP1: CLC SHR AL,01H JC ONES ADD M5,01H

13 DEC CL JNZ UP1 JMP EXIT1 ONES:ADD M6,01H DEC CL JNZ UP1 EXIT1:LEA DX,M2 MOV AH,09H ADD M5,30H MOV DL,M5 MOV AH,02H LEA DX,M1 MOV AH,09H ADD M6,30H MOV DL,M6 MOV AH,02H MOV AH,4CH END

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15 8. Write an ALP to find the LCM of two 8-bit numbers.model SMALL.DATA N1 db 7 N2 db 2 R db 2 dup (0).CODE MOV AX,@DATA MOV DS,AX MOV AL,N1 MOV BL,N2 START: PUSH AL PUSH BL DIV BL CMP AH,0 JE EXIT POP DL POP AL ADD AL,N1 ADC AH,0 JMP START EXIT: POP BL POP AL MOV R, AH MOV AH,4CH END

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17 10. Write and ALP to find the EVEN and ODD numbers in an array of five 16-bit numbers and store them in two different arrays in memory.model SMALL.DATA ARR DW 1234H,2345H,3456H,4567H,5678H LEN DW ($-ARR)/2 EVENARR DW 8000H ODDARR DW 9000H.CODE MOV MOV DS,AX MOV CX,LEN LEA SI,ARR MOV BX,ODDARR MOV DI,EVENARR BACK:MOV AX,[SI] SHR AX,01H JNC EVEN1 MOV AX,[SI] MOV [BX],AX INC BX INC BX JMP NEXT EVEN1:MOV AX,[SI] MOV [DI],AX INC DI INC DI NEXT:INC SI INC SI LOOP BACK MOV AH,4CH END