已知累加器(A)=40H,(R0)=40H,内部RAM(30H)=50H ,(40H)=60H, 执行完后一下哪条指令后A的内容为40H 。( )
A: MOV A,
B: 30H
C: MOV A,30H
D: MOV A,R0
E: MOV A,@R0
A: MOV A,
B: 30H
C: MOV A,30H
D: MOV A,R0
E: MOV A,@R0
举一反三
- 已知:(30H)=23H,(31H)=13H,(40H)=72H,(41H)=08H 执行: MOV A,30H ADD A,40H DA A MOV 30H,A MOV A,31H ADDC A,41H DA A MOV 31H,A 则结果为:(30H)=______H,(31H)=______H,(40H)=______H,(CY)=______。
- 若(R1)=30H,(A)=40H,(30H)=60H,(40H)=08H。 试分析执行下列程序段后上述各单元内容的变化。 MOV A,@R1 MOV @R1,40H MOV 40H,A MOV R1,#7FH (R1)=();(A)=();(30H)=();(40H)=()
- 执行如下三条指令后,30H单元的内容是( ) MOV R1,#30H MOV 40H,#0EH MOV @R1,40H
- 执行如下三条指令①MOV R1,#30H ② MOV 40H,#0EH③MOV @R1,40H后,30H单元的内容是:
- 中国大学MOOC: 执行如下3条指令后,30H单元的内容是()。MOV R1,#30H MOV 40H,#0EH MOV ﹫R1,40H