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
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
BAS DB 11,22,33,44,55 NUM DB 10,20,30,40,50 IN DB 1,2,3 代码段定义如下: MOV BX,OFFSET BAS LEA SI,IN MOV DI,4 MOV AX,[SI+2] ;(AX)=【1】H XCHG AX,[SI] ;(AX)=【2】H MOV AX,4[BX] ;(AX)=【3】H MOV AX,[BX][DI] ;(AX)=【4】H
BAS DB 11,22,33,44,55 NUM DB 10,20,30,40,50 IN DB 1,2,3 代码段定义如下: MOV BX,OFFSET BAS LEA SI,IN MOV DI,4 MOV AX,[SI+2] ;(AX)=【1】H XCHG AX,[SI] ;(AX)=【2】H MOV AX,4[BX] ;(AX)=【3】H MOV AX,[BX][DI] ;(AX)=【4】H
用80C51的定时器T1作定时方式,用模式2,则初始化编程为( )。 A: MOV TOMD, B: 06H C: MOV TOMD, D: 20H E: MOV TOMD, F: 10H G: MOV TOMD, H: 60H
用80C51的定时器T1作定时方式,用模式2,则初始化编程为( )。 A: MOV TOMD, B: 06H C: MOV TOMD, D: 20H E: MOV TOMD, F: 10H G: MOV TOMD, H: 60H
写出下列程序段执行后AX的值为多少? MOV AX, 1234H; AX=(1)H MOV CL, 4 AND AL, 0FH; AX= (2) H ADD AL, 30H; AX= (3)H SHL AH, CL; AX= (4)H AND AH, 0F3H; AX= (5)H
写出下列程序段执行后AX的值为多少? MOV AX, 1234H; AX=(1)H MOV CL, 4 AND AL, 0FH; AX= (2) H ADD AL, 30H; AX= (3)H SHL AH, CL; AX= (4)H AND AH, 0F3H; AX= (5)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)=______。
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)=______。
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
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
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:
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: 设DS=2000H,SS=4000H, BX=1000H,BP=1000H, (21000H)=1234H, (21002H)=5678H,(41000H)=3456H, (41002H)=789AH。写出下列三条指令执行后的结果。(注:答案和答案之间用一个空格分开)(1)MOV AX, DS:[1000H] AX=_____________H。(2)MOV AL,BYTE PTR [BX+2] AL=_____________H。(3)MOV AH, [BP] AH=_____________H。
中国大学MOOC: 设DS=2000H,SS=4000H, BX=1000H,BP=1000H, (21000H)=1234H, (21002H)=5678H,(41000H)=3456H, (41002H)=789AH。写出下列三条指令执行后的结果。(注:答案和答案之间用一个空格分开)(1)MOV AX, DS:[1000H] AX=_____________H。(2)MOV AL,BYTE PTR [BX+2] AL=_____________H。(3)MOV AH, [BP] AH=_____________H。
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
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