题目内容

The contents of A and B after execution of following instructions will be( ) MOV A, #02H MOV B, #04H MUL AB

A=02H, B=04H
B. A=08H, B=04H
C. A=08H, B=00H
D. A=00H, B=08H

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Which of the following instructions require maximum execution time?( )

ADD A, @R0
B. DA A
C. MUL AB
D. INC A

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()=F0H, (R0)=30H, and (30H)=AAH. After execution of an instruction XCH A, @R0, accumulator will be,( )

AAH
B. F0H
C. 30H
D. 78H

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()=F0H, (R1)=40H, and (40H)=0FH. After execution of an instruction XCHD A, @R1, accumulator will be,( )

A. 00H
B. F0H
C. 0FH
D. FFH

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Instruction “MOV A, @R1” will ( )

A. copy R1 to the accumulator
B. copy the accumulator to R1
C. copy the contents of internal RAM pointed by R1 to accumulator
D. copy the contents of external RAM pointed by R1 to accumulator

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The contents of A and B after execution of following instructions will be( ) MOV A, #02H MOV B, #04H MUL AB

A=02H, B=04H B. A=08H, B=04H C. A=08H, B=00H D. A=00H, B=08H

Which of the following instructions require maximum execution time?( )

()=F0H, (R0)=30H, and (30H)=AAH. After execution of an instruction XCH A, @R0, accumulator will be,( )

()=F0H, (R1)=40H, and (40H)=0FH. After execution of an instruction XCHD A, @R1, accumulator will be,( )

Instruction “MOV A, @R1” will ( )

A=02H, B=04H
B. A=08H, B=04H
C. A=08H, B=00H
D. A=00H, B=08H