下列指令格式正确的是( )。
A: DEL:XCHA, 30H
B: MOV:INC A
C: 2AB:MOV A, #20H
D: ABC:MOV 23H, A
A: DEL:XCHA, 30H
B: MOV:INC A
C: 2AB:MOV A, #20H
D: ABC:MOV 23H, A
举一反三
- 根据下列程序段运行情况,将运行结果和指令分别补充完整。 (1)( );(A)=10H ( );(B)=10H ( );(A)=20H MOV 23H,A;(23H)=20H ( );(A)=21H MOV 24H,A;(24H)=21H INC A ;(A)=22H ( );(25H)= 22H (2)MOV A,#50H;(A)=( )H MOV R0,A;(R0)=( )H MOV @R0,#30H;(50H)=( )H ADD A,@R0;(A)=( )H MOVX @R0,A;(50H)=( )H
- 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)=______。
- 请说明下列指令属于哪一种寻址方式? MOV 23H,#30H () MOV 12H,A() MOV R0,#23H() MOV R7,12H() MOV R1,#12H() MOV A,@R0() MOV 34H,@R1() MOV 45H,34H() MOV DPTR,#6712H() MOV 12H,DPH() MOV R0,A() MOV A,@R0() A 立即寻址 B 直接寻址 C 间接寻址 D 寄存器寻址
- 指令 MOV R0,20H 执行前 (R0)=30H, (20H)=38H,执行后(R0)=?
- 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