单片机上机操作考试题部分答案

1、1.使得8个发光二极管循环点亮，采用定时器方式0使得每个发光二极管点亮的时间为0.5s#include<reg51.h>#include<intrins.h>#defineucharunsignedcharucharT_count=0;/定时中断voidtoProc()interrupt1TH0=(8192-5000)/32;/恢复初值TL0=(8192-5000)%32;if(+T_count=100)/0.5s移动一位P0=_crol_(P0,1);T_count=0;/主函数voidmain()TMOD=0;TH0=(8192-5000)/32;/5ms定时TL0

2、=(8192-5000)%32;EA=1;ET0=1;TR0=1;P0=0xfe;while(1);2.完成下面电路所示的功能，K1,K2对应两个开关按键。P1口对应发光二极管的状态P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0ooOOooooK1=0,K2=1.ooooK1=1,K2=0.oo.ooK1=1,K2=1.#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharsbitk1=P3人2;sbitk2=P3人3;/延时voiddelay(uintx)uchari;wh

3、ile(-x)for(i=0;i<120;i+);)/主函数voidmain()(while(1)(if(k1=0)&&(k2=0)(P1=0x00;delay(10);)elseif(k1=0)&&(k2=1)(P1=0xcc;delay(10);)elseif(k1=1)&&(k2=0)(P1=0xf0;delay(10);)else(P1=0xff;delay(10);)3.在一个数码管上循环显示“H'"E'#include<reg51.h>#defineucharunsignedchar#def

4、ineuintunsignedintucharcodetab=0xf6,0xf9,0xb8,0xb8,0xbf);ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%5;/K1、K2同时按下/K1按下，K2不按/K2按下，K1不按L，“l，“o，,循环的时间为1sT_count=0;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);)4.在6个数码管上分

5、别显示自己学号的后六位数字#include<reg51.h>#include<intrins.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=;/学号自己设置/延时voiddelay(uintx)uchari;while(x-)for(i=0;i<100;i+);/主函数voidmain()uchark;ucharwei=0x01;P0=tab0;P2=0x01;delay(1000);while(1)for(k=1;k<6;k+)wei=wei<<1;P0=tabk;/发

6、送数字段码P2=wei;/发送位码delay(1000);)5.做一个简易30s的倒计时秒表，秒表的显示通过8个发光二极管显示出来。#include<reg51.h>#defineucharunsignedcharvoiddelay1s()uchari;for(i=0;i<10;i+)TH1=0x3c;TL1=0xb0;TR1=1;/启动T1while(!TF1);/判断T1有无请求TF1=0;)voidmain()uchari;uchart;TMOD=0x10;/选择T1计时while(1)for(i=30;i>0;i-)t=(i/10)<<4)|(i%1

7、0);高四位显示十位，低四位显示个位P1=t;delay1s();)）6.使用外中断0来控制，去实现下列功能。其中K1为按键，P1口对应8个发光二极管的状态P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7无按键按下（循环）.OO.OO.OO.有按键按下.OOOO#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharucharcodetab=0xcc,0x30;sbitk1=P3人2;/延时voiddelay(uintx)uchari;while(-x)(for(i=0;i<120;i+);

8、)voidint0Proc()interrupt0(P1=0xf0;)/主函数voidmain()(ucharj;EA=1;EX0=1;IE0=1;while(1)(if(k1=1)/未按下(for(j=0;j<2;j+)(P1=tabj;delay(500);)8.采用定时器方式1使得8个发光二极管按如下方式点亮，循环的时间为2sP1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7oooFo.oooo.oo.oo.#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab

9、=0x0f,0xf0,0xcc,0x00;ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=20)(P0=tabi;i=(i+1)%4;T_count=0;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);)9.在一个数码管上循环显示“0”“1”“5”3个数字，循环的时间为1s#include<reg51.h>#defineucharunsignedchar#defineuin

10、tunsignedintucharcodetab=0xbf,0x86,0xed;ucharT_count=0;uchari=1;voidintoProc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%3;T_count=0;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);10.在4个数码管上稳定显示出“A”“C”“E”“P”四个字符。#include<reg51.h>#defineucharunsigned

11、char#defineuintunsignedintvoiddelay(uintx)uchari;while(x-)for(i=0;i<100;i+);voidmain()while(1)P0=0xf7;/AP2=0xb9;/CP3=0xf9;/EP1=0xf3;/Pdelay(500);12.做一个20s的简易秒表，当按键K1按下时，秒表暂停计数，K2按下时，开始计数#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharuchartab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7

12、d,0x07,0x7f,0x6f;sbitk1=P3人2;sbitk2=P3人3;ucharT_count=0;uchari=0;voiddelay(intx)uchari;while(x-)for(i=0;i<100;i+);voidt0Proc()interrupt1TH0=0x3c;/恢复定时器0初值TL0=0xb0;if(+T_count=10)/100ms*10=1s转换状态i+；P0=tabi/10;P2=tabi%10;if(i=20)(i=0;)T_count=0;)voidmain()(P0=tabi;P2=tabi;TMOD=0x01;TH0=0x3c;TL0=0xb

13、0;while(1)(if(k1=0&&k2=1)(EA=0;ET0=0;TR0=0;break;)elseif(k1=1&&k2=0)(EA=1;ET0=1;TR0=1;break;)14.使用外中断1来控制，当无按键按下时8个发光二极管循环点亮，循环点亮的时间为1s,有按键按下时，8个发光二极管全部熄灭。#include<reg51.h>#include<intrins.h>#defineucharunsignedchar#defineuintunsignedintsbitk1=P3人2;ucharcodetab=0x01,0x03,

14、0x07,0x0f,0x1f,0x3f,0x7f,0xff);ucharT_count=0;uchari=1;/T0定时voidT0Proc()interrupt1(TH0=0x3c;TL0=0xb0;if(+T_count=10)(P1=tabi;i=(i+1)%8;T_count=0;/INT1中断函数voidInt1Proc()interrupt2(P1=0xff;EA=0;EX1=0;IT1=0;ET0=0;TR0=0;/主程序voidmain()(TMOD=1;EA=1;ET0=1;TR0=1;TH0=0x3c;TL0=0xb0;EX1=1;IT1=1;P1=0xfe;while(1

15、);16.完成下面电路所示的功能，K1,K2对应两个开关按键。P1口对应发光二极管的状态P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0.K1=0,K2=1.ooooK1=1,K2=0oooo.ooK1=1,K2=1o.o.o.o.#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharsbitk1=P3人2;sbitk2=P3人3;/延时voiddelay(uintx)(uchari;while(-x)(for(i=0;i<120;i+);/主函数voidmain()(w

16、hile(1)(if(k1=1)&&(k2=1)都未按下0:未按下，1:按下(P1=0x00;delay(10);elseif(k1=1)&&(k2=0)/k2按下，k1未按下(P1=0xf0;delay(10);elseif(k1=0)&&(k2=1)/k1按下，k2未按下(P1=0xcf;delay(10);elseif(k1=0)&&(k2=0)/都按下(P1=0x55;delay(10);完成下面电路的功能，P1口对应发光二极管的状态，状态1显示的时间为1s,状态2显示的时间为2s,状态3显示的时间为3s,如此循环P1.0

17、P1.1P1.2状态1.Fo.状态2o.状态3.o#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x05,0x06,0x03;ucharT_count=0;ucharState=0;uchari=1;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;switch(State)(case0:if(+T_count=10)(P1=tabi;i=(i+1)%3;T_count=0;State=1;break;case1:if(+T_count=20)(

18、P1=tabi;i=(i+1)%3;T_count=0;State=2;break;case2:if(+T_count=30)(P1=tabi;i=(i+1)%3;i=1;T_count=0;State=0;break;voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);)17. 彩灯系统，实现8个发光二极管从左到右点亮，每个发光二极管点亮的时间为2s,然后从右到左亮，每个发光二极管点亮的时间为1.5s.#include<reg51.h>#include<intrins.h>#def

19、ineucharunsignedcharucharcodetab=0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80;ucharcodetab1=0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01;ucharState=0;ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;switch(State)case0:if(+T_count=20)P2=tabi;i=(i+1)%8;if(i=7)State=1;T_count=0;break;case1:if(+T_c

20、ount=15)i=(i+1)%8;P2=tab1i;if(i=7)State=0;i=1;T_count=0;break;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P2=tab0;while(1);)18. 在4个数码管上显示出当天的日期。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x06,0x5b,0x06,0x6f);voiddelay(intx)uchari;while(x-)for(i=0;i<

21、;120;i+);)voidmain()P0=tab0;P2=tab1;P3=tab2;P1=tab3;delay(500);)19. 完成下面电路的功能，P1口对应发光二极管的状态，状态1显示的时间为3s,状态2显示的时间为1s,状态3显示的时间为0.5s,状态4显示的时间为0.1s,如此循环P1.0P1.1P1.2P1.3状态1oo.状态2o.状态3.状态4oooo#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x0c,0x0e,0x0f,0x00;ucharT_count

22、=0;ucharState=0;uchari=1;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;switch(State)(case0:if(+T_count=30)(P1=tabi;i=(i+1)%4;T_count=0;State=1;break;case1:if(+T_count=10)(P1=tabi;i=(i+1)%4;T_count=0;State=2;break;case2:if(+T_count=5)(P1=tabi;i=(i+1)%4;T_count=0;State=3;break;case3:if(+T_count=1)(P1=tabi;

23、i=(i+1)%4;T_count=0;State=0;break;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);数码管数字显示控制程序设计。控制要求：用按键K1和K2分别控制数码管显示数字09的顺序，当按下K1键时按从0到9的顺序显示，当按下K2时按从9到0的顺序显示。时间间隔均为1秒。硬件电路如图所示。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab1=0x3f,0x06,0x5b,0x

24、4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;ucharcodetab2=0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;ucharT_count=0;sbitk1=P1A0;sbitk2=P1A1;uchari=0;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)T_count=0;i=(i+1)%10;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P0=0x3f;while(1)if(k1=0&

25、;&k2=1)P0=tab1i;elseif(k1=1&&k2=0)(P0=tab2i;23. 89C51与PC通过串口通信，单片机采用方式3串行通信，晶振都采用12MHz，波特率为1200Baud。要求:当单片机收到PC发来的数据“S”后，将30H-3FH的16个字节发送给乙机，当单片机收到“P”H时就发40H-5FH的32个字节数据。#include<reg51.h>#include<stdio.h>char*startPoint;char*endPoint;voidsendData()(if(startPoint<=endPoint)

26、(SBUF=*startPoint;+startPoint;voidstartSend(char*start,char*end)(startPoint=start;endPoint=end;sendData();voidserialPorc()interrupt4(if(TI)(TI=0;sendData();else(RI=0;if(0x53=SBUF)(startSend(0x30,0x3f);elseif(0x50=SBUF)(startSend(0x40,0x5f);voidmain()(TMOD=0x20;TH1=0xe6;TL1=0xe6;TR1=1;SCON=0xd0;EA=1;

27、ES=1;24. while(1);交通控制系统，如下图所示，是交叉路口，要求：绿灯亮9秒后，黄灯闪3秒，后红灯亮9秒，两个数码管分别显视各种灯所剩余时间。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab卜0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;ucharcodetab1=0x4f,0x5b,0x06,0x3f;sbitRED_A=P0A0;sbitYELLOW_A=P0A1;sbitGREEN_A=P0A2;sbitRE

28、D_B=P0A3;sbitYELLOW_B=P0A4;sbitGREEN_B=P0A5;ucharOperation_Type=1;/操作类型变量ucharT_count=0;uchari=0;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;switch(Operation_Type)case1:/红灯亮RED_A=0;YELLOW_A=1;GREEN_A=1;RED_B=0;YELLOW_B=1;GREEN_B=1;if(+T_count=90)T_count=0;Operation_Type=2;i=0;if(T_count%10=0)(P3=tabi;P1

29、=tabi;i=(i+1)%10;break;case2:黄灯闪RED_A=1;YELLOW_A=YELLOW_A;GREEN_A=1;RED_B=1;YELLOW_B=YELLOW_B;GREEN_B=1;if(+T_count=30)(T_count=0;Operation_Type=3;i=0;if(T_count%10=0)(P3=tab1i;P1=tab1i;i=(i+1)%3;break;case3:/绿灯亮RED_A=1;YELLOW_A=1;GREEN_A=0;RED_B=1;YELLOW_B=1;GREEN_B=0;if(+T_count=90)(T_count=0;Oper

30、ation_Type=1;i=0;if(T_count%10=0)(P3=tabi;P1=tabi;i=(i+1)%10;break;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;P3=tab0;while(1);)26用外部中断1实现加计数功能，并将计数值输出到数码管上显示。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedint/09的段码ucharcodeDSY_CODE卜0x3f,0x06,0x5b,0x4f,0x66,0x6d

31、,0x7d,0x07,0x7f,0x6f,0x00;/计数值分解后各个待显示的数位ucharDSY_Buffer=0,0,0;ucharCount=0;sbitClear_Key=P3人6;/数码管上显示计数值voidShow_Count_ON_DSY()DSY_Buffer2=Count/100;/获取3个数DSY_Buffer1=Count%100/10;DSY_Buffer0=Count%10;if(DSY_Buffer2=0)/高位为0时不显示DSY_Buffer2=0x0a;if(DSY_Buffer1=0)/高位为0,若第二位为。同样不显示DSY_Buffer1=0x0a;P0=D

32、SY_CODEDSY_Buffer0;P1=DSY_CODEDSY_Buffer1;P2=DSY_CODEDSY_Buffer2;/主程序voidmain()P0=0x00;P1=0x00;P2=0x00;EA=1;EX1=1;IT1=1;/下降沿触发while(1)(if(Clear_Key=0)(Count=0;/清0Show_Count_ON_DSY();/INT1中断函数voidEX_INT1()interrupt2(Count+;/计数值递增28.LED灯要求亮2秒钟，灭2秒钟，要求使用定时计数器，要求写主程序与中断程序，fosc=6MHz#include<reg51.h>

33、;#defineucharunsignedcharucharT_count=0;sbitLED=P1A0;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;if(+T_count=20)(T_count=0;LED=LED;voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;while(1);29利用外部中断0,每申请一次中断使P0口连接的发光二极管点亮一个，从低位到高位，同时使P1口连接的发光二极管熄灭一个，从高位到低位#include<reg51.h>#defineucharunsignedcharucharcodetab=0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff);uchari=0;/INT1中断函数voidEX_INT1()interrupt2P0=tabi;P1=tabi;if(+i=8)i=0;)/主程序voidmain()P0=0xff;P1=0x00;EA=1;EX0=1;IT0=1;/下降沿触发while(1);)31.用定时计