單項(xiàng)選擇題下列指令能使累加器A低4位不變,高4位置F的是()

A. ANL A,#0FH    
B. ANL A,#0F0H    
C. ORL A,#0FH   
D. ORL A,#0F0H


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1.單項(xiàng)選擇題下列指令能使累加器A高4位不變,低4位清0的是()

A.ANL A,#0FH
B.ANL A,#0F0H    
C.ORL A,#0FH    
D.ORL A,#0F0H

2.單項(xiàng)選擇題指令MUL AB執(zhí)行前()=18H,(B)=05H,執(zhí)行后A,B的內(nèi)容為()

A.90H,05H
B.90H,00H
C.78H,05H
D.78H,00H

3.單項(xiàng)選擇題指令A(yù)DDC A,@R0執(zhí)行前()=38H,(R)=30H,(30H)=F0H,(C)=1,執(zhí)行后()

A.(A)=28H,(C)=1
B.(A)=29H,(C)=0
C.(A)=68H,(C)=1

4.單項(xiàng)選擇題指令A(yù)DD A,R0執(zhí)行前()=38H,(R)=54H,(C)=1,執(zhí)行后()

A.(A)=92H,(C)=1
B.(A)=92H,(C)=0
C.(A)=8CH,(C)=1
D.(A)=7AH,(C)=0

5.單項(xiàng)選擇題指令MOVX@DPTR,A執(zhí)行前()=03H,(DPTR)=0101H,(0101H)=35H,執(zhí)行后()

A.(A)=35H
B.(DPTR)=35H
C.(0101H)=03H
D.(A)=05H