ljmp start表示跳转到标签start所在的位置继续执行程序。 这里的start是一个标签,它必须在程序的后续部分被定义。 跳转的具体实现是通过计算start标签的偏移地址,并将程序的计数器(IP)设置为该地址,从而跳转到start标签处执行。 org 0100h指令的作用,并说明它如何与前面的指令配合: 第二个org指令org 0100h改变了程...
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LJMP START ;跳转到(PC)=0030H处 ORG 30H START: MOV DPTR,#1100H ;#1100H->DPTR (DPTR)=1100H CLR A ;0->A (A)=00H MOV R1,#20H ;#20H->R1 (R1)=20H SETB C ;1->Cy (Cy)=1 A. (A)=21H B. MOV @R1,A ;(A)->((R1)) (20H)=21H C. INC A ;(A)+1->A (A)=22...
LJMP START ;跳转到(PC)=0030H处 ORG 30H START: MOV SP,#50H ;#50H->SP (SP)=50H MOV DPTR,#3000H ;#3000H->DPTR (DPTR)=3000H MOV R0,#20H ;#20H->R0 (R0)=20H MOV A,#23H ;#23H->A (A)=23H MOV R2,#0FH ;#0FH->R2 (R2)=0FH ...
LJMP START ;跳转到(PC)=0030H处 ORG 30H START: MOV DPTR,#1000H ;#1000H->DPTR (DPTR)=1000H MOV A,#13H ;#13H->A (A)=13H CLR C ;Cy←0,(Cy)=0 SUBBA,#0ACH ;A←(A)-#0ACH-(Cy),(A)=0CDH,(Cy)=1 RRCA;累加器内容带进位循环右移,(A)=0E6H,(Cy)=1 MOV DPTR,#1730H;...
LJMP START ;跳转到(PC)=0030H处 ORG 30H START:MOV SP,#50H ;#50H->SP (SP)=50H MOV R2,#10H ;#10H->R2 (R2)=10H MOVDPTR,#3000H ;#3000H->DPTR (DPTR)=3000H CRL A ;0->A (A)=0 LOOP: MOVX @DPTR,A ;(A)->(DPTR) ...
LJMP START ;跳转到(PC)=0030H处 ORG 30H START: MOV DPTR,#1000H ;#1000H->DPTR (DPTR)=1000H MOV A,#13H ;#13H->A (A)=13H MOV R0,#20H ;#20H->R0 (R0)=20H SETB C ;1->Cy (Cy)=1 MOV @R0,A ;(A)->((R0)) (20H)=13H ...
LJMPSTART;跳转到(PC)=0030H处 ORG 30H START:MOV SP,#50H;#50H->SP (SP)=50H MOV DPTR,#2000H;#3000H->DPTR (DPTR)=2000H MOV 20H,#06H;#06H->20H (20H)=06H MOVR0,#20H;#20H->R0 (R0)=20H MOV A,#35H;#35H->A (A)=35H ...
LJMP START;跳转到(PC)=0030H处 END (Cy)=___(SP)=___ (DPTR)=___(1000H)=___(1001H)=___ 评分办法:指令注释占5分,对于程序段注释部分写对的学生可酌情给1-4分;程序段执行结果每空1分,共5分。 相关知识点: 试题来源: 解析 0 51H 109FH 0A 8H 0A 9H 反馈 收藏 ...
LJMP START;跳转到START处 ORG 30H START: MOV SP,#6FH ;SP←#6FH, (SP)=6FH MOV A,#08H ;A←#08H, (A)=08H MOV R2,#8;R2←#8, (R2)=08H MOV R0,#20H;R0←#20H, (R0)=20H LOOP: MOV @R0,A;(R0)←(A),循环结束后(20H)～(27H)=08H～01H DEC A ;A←(A)-1 INC R0 ;R0...