执行如下三条指令后,30H单元的内容是() M O V R1,#30H M O V 40H,#0 E H M O V @R1,40H
A.40H
B.30H
C.0EH
D.FFH
A.40H
B.30H
C.0EH
D.FFH
A、见评论
B、见评论
C、见评论
D、见评论
A. (2FH)=30H(30H)=40H
B. (2FH)=61H(30H)=40H
C. (2FH)=60H(30H)=60H
D. (2FH)=30H(30H)=60H
MOV 50H,30H ;(50H)=11H
MOV R0,#40H ;R0=40H
MOV A,11H ;A=22H
MOV 60H,@R0 ;(60H)=33H,R0=40H不变
MOV @R0,A ;(40H)=22H,R0=40H不变
MOV 30H,R0 ;(30H)=40H
A. int data x[10];
B. int xdata x[10];
C. int code x[10];
D. int idata x[10];
B.MOVR1,#40H
MOVX@R1,AMOVXR1,A
C.MOVX40H,A
D.MOVR1,#40H
MOVX@R1,A
A、SETB ET0 SETB ES
B、SETB ET0 SETB EA
C、SETB ET0 SETB EX0
D、SETB ET1 SETB EA
MOV 50H,#40H ;(50H)=40H
MOV R1,#50H ;R1=50H
MOV A,@R1 ;A=(R1)=(50H)=40H
MOV R0,A ;R0=40H
MOV 60H,@R0 ;(60H)=(R0)=(40H)=FFH
MOV 30H,60H ;(30H)=FFH
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