《单片机》读程序题题库答案.docx
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《单片机》读程序题题库答案.docx
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《单片机》读程序题题库答案
四、阅读下列程序,注释并填写指令执行后的结果(每题10分)
1、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVR0,#20H;#20H->R0(R0)=20H
MOVR1,#30H;#30H->R1(R1)=30H
MOVA,R0;(R0)->A(A)=20H
ADDA,#36H;(A)+#36H->A(A)=56H
MOVP1,A;(A)->P1(P1)=56H
INCR0;(R0)+1->R0(R0)=21H
INCR1;(R1)+1->R0(R1)=31H
ANLA,R1;(A)&(R1)->A(A)=10H
SWAPA;累加器A的高低4位交换(A)=01H
PUSHACC;累加器A内容压栈
MOVP1,A;(A)->P1(P1)=01H
POPB;堆栈内容出栈到B寄存器(B)=01H
MOVR0,A;(A)->R0(R0)=01H
MOVDPTR,#2200H;#2200H->DPTR(DPTR)=2200H
SETBC;1->Cy(Cy)=1
ADDCA,#0;(A)+0+(Cy)->A(A)=02H
MOVX@DPTR,A;(A)->(DPTR)(2200H)=02H
END
(R0)=01H(R1)=31H(P1)=01H
(B)=01H(2200H)=02H
2、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVSP,#50H;#50H->SP(SP)=50H
MOVR2,#10H;#10H->R2(R2)=10H
MOVDPTR,#3000H;#3000H->DPTR(DPTR)=3000H
CRLA;0->A(A)=0
LOOP:
MOVX@DPTR,A;(A)->(DPTR)
INCDPTR;(DPTR)+1->DPTR
DJNZR2,LOOP;(R2)-1->R2若(R2)不等于零则转移到LOOP处
INCDPH;(DPH)+1->DPH(DPH)=31H(R2)=00H(DPL)=10H
INCDPH;(DPH)+1->DPH(DPH)=32H
MOV20H,#36H;#36H->(20H)(20H)=36H
SETB00H;位地址00H置120H.0=1(20H)=37H
MOVA,20H;(20H)->A(A)=37H
MOVX@DPTR,A;(A)->(DPTR)(DPTR)=3210H(3210H)=37H
INCA;(A)+1->A(A)=38H
INCA;(A)+1->A(A)=39H
PUSHACC;累加器A内容压栈(SP)=51H
XCHA,R2;累加器A的内容与R2内容互换(A)=00H(R2)=39H
POPDPH;堆栈内容弹到DPH(DPH)=39H
ADDA,#55H;(A)+#55H->A(A)=55H
PUSHACC;累加器A内容压栈
END
(A)=55H(R2)=39H(20H)=37H(DPTR)=3910H(SP)=51H
3、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVR0,#30H;#30H->R0(R0)=30H
MOVA,#12H;#12H->A(A)=12H
SETBC;(Cy)=1
ADDCA,R0;(A)+(R0)+Cy->A(A)=43H
MOV@R0,A;(A)->(R0)(30H)=43H
SWAPA;累加器A高低4位交换(A)=34H
INCA;(A)+1->A(A)=35H
MOVDPTR,#2000H;#2000H->DPTR(DPTR)=2000H
INCDPH;(DPH)+1->DPH(DPH)=21H
MOVP1,A;(A)->P1(P1)=35H
INCA;(A)+1->A(A)=36H
MOVX@DPTR,A;(A)->(DPTR)(2100H)=36H
XCHA,R0;(A)R0(A)=30H(R0)=36H
RLA;累加器A内容循环左移(A)=60H
PUSHACC;累加器A的内容入栈
RLA;累加器A内容循环左移(A)=0C0H
POPACC;堆栈内容弹出到累加器A(A)=60H
END
(A)=60H(R0)=36H(DPTR)=2100H
(P1)=35H(30H)=43H
4、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVSP,#50H;#50H->SP(SP)=50H
MOVDPTR,#3000H;#3000H->DPTR(DPTR)=3000H
MOVR0,#20H;#20H->R0(R0)=20H
MOVA,#23H;#23H->A(A)=23H
MOVR2,#0FH;#0FH->R2(R2)=0FH
SETB01H;置位20H.1(20H.1)=1
SETBC;置位Cy(Cy)=1
ADDCA,@R0;(A)+((R0))+Cy->A(A)=26H
INCR0;(R0)+1->R0(R0)=21H
MOV@R0,A;(A)->((R0))(21H)=26H
LOOP:
DJNZR2,LOOP;(R2)-1->R2若R2内容不等于零则转移
SWAPA;累加器A内容的高低4位交换(A)=62H
PUSHACC;累加器A内容入栈
INCDPH;(DPH)+1->DPH(DPH)=31H
MOVX@DPTR,A;(A)->(DPTR)(3100H)=62H
POPB;堆栈内容弹出到B(B)=62H
RRA;累加器A内容循环右移(A)=31H
ADDA,B;(A)+(B)->A(A)=93H
MOVP1,A;(A)->P1(P1)=93H
END
(21H)=26H(R2)=00H(A)=93H(B)=62H(3100H)=62H
5、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVDPTR,#1000H;#1000H->DPTR(DPTR)=1000H
MOVA,#13H;#13H->A(A)=13H
MOVR0,#20H;#20H->R0(R0)=20H
SETBC;1->Cy(Cy)=1
MOV@R0,A;(A)->((R0))(20H)=13H
RLCA;累加器A的内容带进位循环左移(A)=27H
XCHA,@R0;累加器A的内容与20H单元的内容互换(A)=13H(20H)=27H
PUSHACC;累加器A的内容入栈
POPDPL;堆栈内容弹出到DPL(DPL)=13H
MOVX@DPTR,A;(A)->(DPTR)(1013H)=13H
DECA;(A)-1->A(A)=12H
PUSHDPH;DPH内容压栈
POPB;堆栈内容弹出到B(B)=10H
ADDA,B;(A)+(B)->A(A)=22H
MOVP1,A;(A)->P1(P1)=22H
CLRA;累加器A内容清零
ADDA,B;(A)+(B)->A(A)=10H
END
(P1)=22H(B)=10H(20H)=27H(DPTR)=1013H(R0)=20H
6、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVSP,#50H;#50H->SP(SP)=50H
MOVR0,#20H;#20H->R0(R0)=20H
MOVR2,#10H;#10H->R2(R2)=10H
MOVA,#24H;#24H->A(A)=24H
LOOP:
MOV@R0,A;(A)->((R0))
INCR0;(R0)+1->R0
DJNZR2,LOOP;(R2)-1->R2若R2内容不等于0则跳转到LOOP处
SETB00H;1->位地址为00H的位(20H.0)=1(20H)=25H
SETBC;1->Cy(Cy)=1
ADDCA,#00H;(A)+00H+(Cy)->A(A)=25H
SWAPA;累加器A内容高低四位互换(A)=52H
PUSHACC;累加器A内容压栈
POPDPH;堆栈内容弹出到DPH(DPH)=52H
PUSHACC;累加器A内容压栈
POPB;堆栈内容弹出到B(B)=52H
MOVA,R2;(R2)->A(A)=00H
MOVDPL,A;(A)->DPL(DPL)=00H
MOVA,B;(B)->A(A)=52H
PUSHACC;累加器A内容压栈(SP)=51H
END
(A)=52H(R2)=00H(20H)=25H(DPTR)=5200H(SP)=51H
7、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
MOVDPTR,#2100H;#2100H->DPTR(DPTR)=2100H
CLRA;0->A(A)=00H
MOVR1,#30H;#30H->R1(R1)=30H
SETBC;1->Cy(Cy)=1
ADDCA,R1;(A)+(R1)+Cy->A(A)=31H
MOV@R1,A;(A)->((R1))(30H)=31H
PUSHACC;累加器A的内容压栈
POPDPL;堆栈内容弹出到DPL(DPL)=31H
RRA;累加器A的内容循环右移(A)=98H
MOVR0,A;(A)->R0(R0)=98H
ORLA,#24H;(A)or24H->A(A)=0BCH
MOVP1,A;(A)->P1(P1)=0BCH
SWAPA;累加器A的内容高低四位交换(A)=0CBH
MOVDPH,A;(A)->DPH(DPH)=0CBH
MOVB,#02H;#02H->B(B)=02H
ADDA,B;(A)+(B)->A(A)=0CDH
CLRACC.3;0->ACC.3(A)=0C5H
SWAPA;累加器A的内容高低四位交换(A)=5CH
END
(A)=5CH(R0)=98H(DPTR)=0CB31H(P1)=0BCH(30H)=31H
8、ORG0
LJMPSTART;跳转到(PC)=0030H处
ORG30H
START:
M
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