已知40H内的数据为33H,执行下面指令后,40H内的数据为()
MOV A,#55H
CPL A
MOV 40H,A
MOV A,#55H
CPL A
MOV 40H,A
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)=______。
- MOV A, #40H执行这条指令后,A的内容是( )H
- 执行下面三条指令后,30H单元的内容是40H。MOV R1,#30HMOV 40H,#0EHMOV R1,40H错误:______改正:______
- 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