题目内容

The contents of the accumulator after execution of following instructions will be( ) MOV A, #55H ORL A, #01H

A. 1BH
B. 55H
C. 3BH
D. 4BH

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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?( )

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

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

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

()=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