下列属于直接寻址的指令是( )
A: MOV A,#50H
B: MOV A,@R0
C: MOV A,20H
D: MOV A,R0
A: MOV A,#50H
B: MOV A,@R0
C: MOV A,20H
D: MOV A,R0
举一反三
- 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
- 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
- 指令 MOV R0,20H 执行前 (R0)=30H, (20H)=38H,执行后(R0)=?
- 设R0=42H,(42H)=80H,A=48H,(50H)=08H,指出下列程序执行后,上述各单元内容的变化。 MOV A,@R0 MOV @R0,50H MOV 50H,A
- 源操作数是寄存器寻址是( )。 A: MOV A, B: 12H C: MOV R7,12H D: MOV R0,A E: MOV 12H,C