MPID MICROPROCESSOR AND ITS INTERFACING DEVICES EEE III II SEMESTER OBJECTIVE QUESTIONS

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1 MPID MICROPROCESSOR AND ITS INTERFACING DEVICES EEE III II SEMESTER OBJECTIVE QUESTIONS

2 UNIT I 8086 ARCHITECTURE

3 OBJECTIVE TYPE QUESTIONS 1 The number of address spaces of 8085 is ( a) 4 ( b ) 8 ( c ) 2 ( d ) 1 2 One of these is an index register ( a) BP ( b ) SI ( c ) DX (d ) PC 3 Which of these is an 8 bit register? ( a) DX ( b ) CX ( c ) BX ( d ) AH 4 The flag which indicates whether the number of 1s are odd or even in the lower 8 bits is ( a) C Y ( b ) Z (c)p ( d ) S F 5 Which of these bits is used specially in packed BCD arithmetic? ( a) D F ( b ) CY ( c ) AC ( d ) OF 6 EA is used to represent Effective address then what addressing mode does EA = [2000] Represent ( a) Register Direct ( b ) Register indirect (c) Indirect Addressing ( d) immediate addressing 7 Which of these combinations is used by STOSB instruction ( a) ES:DX ( b ) DX:AX ( c ) SS:BP ( d ) DS:SP 8 The width of the SP register is (a) 32 bits (b) 8 bits (c) 24 bits (d) 16 bits 9 The flags used for controlling interrupts is ( a) TF ( b ) AC ( c ) DF ( d )IF 10 Which of these combinations is not allowed in computing address ( a) B P +SP ( b ) B P +DX ( c ) BP+BX ( d ) B X + SP 11 The width of the SP register is (a) 32 bits (b) 8 bits (c) 24 bits (d) 16 bits 12 One of the following is a wrong register pair

4 ( a) CH,DH ( b ) D H, D L ( c ) B H, B L ( d ) A H, A L 13 Which of these flags indicates a carry from a nibble? ( a) CY ( b ) Z (c) 0 ( d )AC 14 The flags used for controlling interrupts is ( a) TF ( b ) AC ( c ) DF ( d )IF 15 Which of these combinations is not allowed in computing address ( a) B P +SP ( b ) B P +DX ( c ) BP+BX ( d ) B X + SP 16 The 8085 is a bit microprocessor ( a) 4 bit ( b ) 8 bit ( c ) 32b it ( d ) 1 6 bit 17 The size of the 8086 flag register is ( a) 32 b its ( b) 1 Gbit s ( c ) 8 bits ( d ) 64 bits 18 One of the following is wrong combination of registers ( a) E S : DX (b ) DS :SP ( c ) D S : SS ( d ) C S : IP 19 The flag which indicates whether the number of 1s are odd or even in the lower 8 bits is ( a) P ( b ) C Y ( c ) S F ( d ) Z 20 The segment size of 8086 is (a)23 KB (b) 56 kb (c) 64KB (d) 60KB ANSWERS 1 d 2 b 3 d 4 c 5 c 6 a 7 d 8 d 9 d 10 b 11 d 12 a 13 d 14 d 15 b 16 b 17 a 18 c 19 a 20 c

5 UNIT II: Instruction set and assembly language programming of 8086

6 OBJECTIVE TYPE QUESTIONS UNIT II: Instruction set and assembly language programming of The first operation done by PUSH instruction is ( a) Upper Byte of data to stack & SP=SP+1 ( b ) Lower Byte of data to stack &SP=SP 1 ( c ) Lower Byte of data to stack & SP=SP+1 ( d ) Upper Byte of data to stack & SP=SP 1 2. The following program will loop how many times MOV AX, 2 MOV DX, OFF AGAI N: MOV CX, OFF DEC DX LOOP AGAIN (a) 10 (b) 255 (c) N F N TE ( d ) Which of these is external to the program code (a) Procedure (b) Macro (c) Library function(d) Sub Routine 4. When a CMP instruction executes and the source and destination operands are not equal what will be condition of Z and carry flag when source is greater than destination (a) Z=1, CY= O (b )Z=0, CY=1 (c) Z=0,CY=0 (d) Z=1,CY=1 5. Which of these cases uses only registers (a) CALL F (b) CALL BX (c) CALL (d) CALL TABLE [BX] 6. Given the program shown below, What is the expression evaluated by this program? MOV AL,[P] MOV BL, [Q] ADD AL, BL MUL AL ADD AL, R

7 MOV CL, S DIV CL (a) (P+Q2+R)/ s (b) ((P+Q)2+R/S (c) (P+(Q+R)2)/S (d ) ((P+Q)2+R)/S 7. Which of these instructions writes a byte to memory? (a) MOV SB (b) LOD SB (c) SCA SB (d) STO SB 8. On the following program what is the final value of the S register. MOV AX, 1000 MOV ES, AX MOV DS, 3000 MOV S, 0 MOV D, O CLD MOV CX, FF AG: MOV SW LOOP AG (A) 01FE (B) 01FF (C) 01FFF (D) 00FF 9. AN 8086 instruction is of which of these forms (a)opcode, Source, Destination ( b ) Op code,destination,source (c)source, destination, Opcode (d) Destination, source, opcode 10. Is the directive which indicates a reference point in memory and is usually used by JUMP Instructions ( a) START ( b ) LABEL ( c ) ORG ( d ) LENGTH 11.In the following program what is the final value of the S register? MOV AX, 1000 MOV ES, AX MOV DS, 3000 MOV S,0 MOV D,0 CLD MOV CX, FF AG:MOV SW LOOP AG ( a) 0 ( b ) 01FFF( c ) 00F F ( d ) 01F E 12. In the following program what is the value of CX after the loop is executed MOV AX,2 MOV DX,0FFFh MOV CX,10 AGA N:DEC DX

8 LOOP AGA N ( a) 0 F F ( b ) 1 ( c) 0 ( d ) 0 F E F 13 Given the program shown below, What is the expression evaluated by this program? MOV AL, [P] MOV BL, [Q] ADD AL, BL MUL AL DIV CL (a)(p+(q+r)2)/s (b)((p+q)2+r)/s (c ) ( P+Q 2 +R)Is (d)((p+q)2+r/s 14. EA is used to represent Effective address then what addressing mode does EA=R Represent ( a) Register Direct (b) indirect Addressing (c)register indirect (d)immediate addressing 15 Which of these is not used by MOV SB instruction? ( a) ES : DX ( b ) DF ( c ) DS : SP ( d ) SS : BP 16. POP instruction utilizes one of the following combinations ( a) CS ; IP ( b ) DS : SS ( c ) SS : B P( d ) SS : S P 17. Which of the following instructions are used for searching a byte in a string of bytes? (a)cmpsb (b) MOVSB (c)scasw (d)scasb 18. Which of these instructions uses BX register to point to at a byte and AL register to took up at a byte is ( a) XOR ( b ) XC H G ( c ) L OO P ( d ) X LAT 19. Which of these instructions reads a byte from memory? (a) MOV SB (b) LOD SB (c) SCA SB (d) STO SB 20. When a CMP instruction executes and the source and destination operands are not equal what will be condition of Z and carry flag when source is less than destination (a) Z=1, CY= 0 (b )Z=0, CY=1 (c) Z=0,CY=0 (d) Z=1,CY=1 ANSWERS: 1 c 2 a 3 a 4 c 5 b 6 d 7 d 8 b 9 c 10 b 11 b 12 c 13 c 14 a 15 c 16 d 17 d 18 d 19 b 20 d

SPRING TERM BM 310E MICROPROCESSORS LABORATORY PRELIMINARY STUDY

SPRING TERM BM 310E MICROPROCESSORS LABORATORY PRELIMINARY STUDY BACKGROUND 8086 CPU has 8 general purpose registers listed below: AX - the accumulator register (divided into AH / AL): 1. Generates shortest machine code 2. Arithmetic, logic and data transfer 3. One