單項選擇題指令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


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1.單項選擇題指令ADDC 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

2.單項選擇題指令ADD 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

3.單項選擇題指令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

4.單項選擇題指令MOVX A,@DPTR執(zhí)行前()=30H,(DPTR)=0100H,(0100H)=35H,執(zhí)行后()

A.(A)=30H
B.(DPTR)=35H
C.(0100H)=30H
D.(A)=35H

5.單項選擇題指令MOV A,@R0執(zhí)行前()=86H,(R)=20H,(20H)=18H,執(zhí)行后()

A.(A)=86H
B.(A)=20H
C.(A)=18H
D.(A)=00H