题目内容

To complement the A, we must exclusive OR() it with( )

A. 7FH
B. 80H
C. FEH
D. FFH

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After execution of following 3 instructions “MOV A, #02H”, “MOV B, #04H”, and “MUL AB”, the contents of A and B will be ( )

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

()=BAH and ()=0. After execution of instruction “SUBB A, #64H”, the status of CY and OV flags will be ( )

A. (CY)=0, (OV)=0
B. (CY)=0, (OV)=1
C. (CY)=1, (OV)=0
D. (CY)=1, (OV)=1

()=65H and ()=0. After execution of instruction “SUBB A, #78H”, the contents of A will be( )

A. EDH
B. DEH
C. 19H
D. 78H

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

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