单片机上机操作考试题部分答案

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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#include#define uchar unsigned charuchar T_count=0;/定时中断void toProc() interrupt 1TH0=(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void main()TMOD=0; TH0=(8192-5000)/32; /5ms定时TL0=(8192-5000)%32;EA=

2、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=0K1=0,K2=1K1=1,K2=0K1=1,K2=1#include#define uint unsigned int#define uchar unsigned charsbit k1=P32;sbit k2=P33;/延时void delay(uint x)uchar i;while(-x)for(i=0;i120;i+);/主函数void main()while(

3、1) if(k1=0)&(k2=0) /K1、K2同时按下P1=0x00;delay(10);else if(k1=0)&(k2=1) /K1按下，K2不按P1=0xcc;delay(10);else if(k1=1)&(k2=0) /K2按下，K1不按P1=0xf0;delay(10);elseP1=0xff;delay(10);3.在一个数码管上循环显示“H”“E” “L” “L” “O” ,循环的时间为1s。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0xf6,0xf9,0xb8,0

4、xb8,0xbf;uchar T_count=0;uchar i=1;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%5;T_count=0;void main()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0; /初始化P0口while(1);4.在6个数码管上分别显示自己学号的后六位数字。#include#include#define uchar unsigned char#define uint unsigned intuchar cod

5、e tab=;/学号自己设置/延时void delay(uint x)uchar i;while(x-)for(i=0;i100;i+);/主函数void main()uchar k;uchar wei=0x01;P0=tab0;P2=0x01;delay(1000);while(1)for(k=1;k6;k+)wei=wei1;P0=tabk;/发送数字段码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#define uchar unsigned charvoid delay1s()uchar i;fo

6、r(i=0;i0;i-) t=(i/10)4)|(i%10); /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）有按键按下#include#define uint unsigned int#define uchar unsigned charuchar code tab=0xcc,0x30;sbit k1=P32;/延时void delay(uint x)uchar i;while(-x)for(i=0;i1

7、20;i+);void int0Proc() interrupt 0P1=0xf0;/主函数void main()uchar j;EA=1; EX0=1;IE0=1;while(1)if(k1=1) /未按下for(j=0;j2;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2sP1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7#include#define uchar unsigned char#define uint unsigned intuchar code tab=0x0f,0xf0,0xcc,0x00

8、;uchar T_count=0;uchar i=1;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;if(+T_count=20)P0=tabi;i=(i+1)%4;T_count=0;void main()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#define uchar unsigned char#define uint unsigned intuchar code

9、 tab=0xbf,0x86,0xed;uchar T_count=0;uchar i=1;void intoProc() interrupt 1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%3;T_count=0;void main()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#define uchar unsigned char#define uint unsi

10、gned intvoid delay(uint x)uchar i;while(x-)for(i=0;i100;i+);void main()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#define uint unsigned int#define uchar unsigned charuchar tab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;sbit

11、 k1=P32;sbit k2=P33;uchar T_count=0;uchar i=0;void delay(int x)uchar i;while(x-)for(i=0;i100;i+);void t0Proc() interrupt 1TH0=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;void main()P0=tabi;P2=tabi;TMOD=0x01;TH0=0x3c; TL0=0xb0;while(1)if(k1

12、=0 & k2=1)EA=0;ET0=0;TR0=0;break;else if(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#include#define uchar unsigned char#define uint unsigned intsbit k1=P32;uchar code tab=0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff;uchar T_count=0;uchar i=1;/

13、T0定时void T0Proc() interrupt 1TH0=0x3c;TL0=0xb0;if(+T_count=10)P1=tabi;i=(i+1)%8;T_count=0;/INT1中断函数void Int1Proc() interrupt 2P1=0xff;EA=0;EX1=0;IT1=0;ET0=0;TR0=0;/主程序void main()TMOD=1;EA=1;ET0=1; TR0=1;TH0=0x3c;TL0=0xb0;EX1=1;IT1=1;P1=0xfe;while(1);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.

14、1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0K1=0,K2=1K1=1,K2=0K1=1,K2=1#include#define uint unsigned int#define uchar unsigned charsbit k1=P32;sbit k2=P33;/延时void delay(uint x)uchar i;while(-x)for(i=0;i120;i+);/主函数void main()while(1) if(k1=1)&(k2=1)/都未按下0：未按下，1:按下P1=0x00;delay(10);else if(k1=1)&(k2=0) /k2按下，k

15、1未按下P1=0xf0;delay(10);else if(k1=0)&(k2=1) /k1按下，k2未按下P1=0xcf;delay(10);else if(k1=0)&(k2=0) /都按下P1=0x55;delay(10);17.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P1.0P1.1P1.2状态1状态2状态3#include#define uchar unsigned char#define uint unsigned intuchar code tab=0x05,0x06,0x03;uchar T

16、_count=0;uchar State=0;uchar i=1;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;switch(State)case 0:if(+T_count=10)P1=tabi;i=(i+1)%3;T_count=0;State=1;break;case 1:if(+T_count=20)P1=tabi;i=(i+1)%3;T_count=0;State=2;break;case 2:if(+T_count=30)P1=tabi;i=(i+1)%3;i=1;T_count=0;State=0;break;void main()TMOD

17、=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);18.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#include#define uchar unsigned charuchar code tab=0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80;uchar code tab1=0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01;uchar State=0;uchar T_cou

18、nt=0;uchar i=1;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;switch(State)case 0:if(+T_count=20)P2=tabi;i=(i+1)%8;if(i=7)State=1;T_count=0;break;case 1:if(+T_count=15)i=(i+1)%8;P2=tab1i;if(i=7)State=0;i=1;T_count=0;break;void main()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P2=tab0;while(1);19. 在4个数码管上显

19、示出当天的日期。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0x06,0x5b,0x06,0x6f;void delay(int x)uchar i;while(x-)for(i=0;i120;i+);void main()P0=tab0;P2=tab1;P3=tab2;P1=tab3;delay(500);20. 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P1.0P1.1

20、P1.2P1.3状态1状态2状态3状态4#include#define uchar unsigned char#define uint unsigned intuchar code tab=0x0c,0x0e,0x0f,0x00;uchar T_count=0;uchar State=0;uchar i=1;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;switch(State)case 0:if(+T_count=30)P1=tabi;i=(i+1)%4;T_count=0;State=1;break;case 1:if(+T_count=10)P1=

21、tabi;i=(i+1)%4;T_count=0;State=2;break;case 2:if(+T_count=5)P1=tabi;i=(i+1)%4;T_count=0;State=3;break;case 3:if(+T_count=1)P1=tabi;i=(i+1)%4;T_count=0;State=0;break;void main()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);23. 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

22、，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#define uchar unsigned char#define uint unsigned intuchar code tab1=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;uchar code tab2=0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;uchar T_count=0;sbit k1=P10;sbit k2=P11;uchar i=0;void t0Proc() interrup

23、t 1TH0=0x3c;TL0=0xb0;if(+T_count=10)T_count=0;i=(i+1)%10;void main()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P0=0x3f;while(1)if(k1=0 & k2=1)P0=tab1i;else if(k1=1 & k2=0)P0=tab2i;24. 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

24、字节数据。#include#includechar *startPoint;char *endPoint;void sendData()if(startPoint = endPoint)SBUF=*startPoint;+startPoint;void startSend(char *start ,char *end)startPoint=start;endPoint = end;sendData();void serialPorc() interrupt 4if(TI)TI=0;sendData();elseRI=0;if(0x53=SBUF)startSend(0x30,0x3f);els

25、e if(0x50=SBUF)startSend(0x40,0x5f);void main()TMOD=0x20;TH1=0xe6;TL1=0xe6;TR1=1;SCON=0xd0;EA=1;ES=1;while(1);25. 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#define uchar unsigned char#define uint unsigned intuchar code tab=0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;u

26、char code tab1=0x4f,0x5b,0x06,0x3f;sbit RED_A=P00; sbit YELLOW_A=P01;sbit GREEN_A=P02;sbit RED_B=P03; sbit YELLOW_B=P04;sbit GREEN_B=P05;uchar Operation_Type=1; /操作类型变量uchar T_count=0;uchar i=0;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;switch(Operation_Type)case 1:/红灯亮RED_A=0;YELLOW_A=1;GREEN_A=1;R

27、ED_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=tabi;i=(i+1)%10;break;case 2: /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;bre

28、ak;case 3: /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;Operation_Type=1;i=0;if(T_count%10=0)P3=tabi;P1=tabi;i=(i+1)%10;break;void main()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#define uchar u

29、nsigned char#define uint unsigned int/09的段码uchar code DSY_CODE=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00;/计数值分解后各个待显示的数位uchar DSY_Buffer=0,0,0;uchar Count=0;sbit Clear_Key=P36;/数码管上显示计数值void Show_Count_ON_DSY()DSY_Buffer2=Count/100; /获取3个数DSY_Buffer1=Count%100/10;DSY_Buffer0=Count%10;if

30、(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0同样不显示DSY_Buffer1=0x0a;P0=DSY_CODEDSY_Buffer0;P1=DSY_CODEDSY_Buffer1;P2=DSY_CODEDSY_Buffer2;/主程序void main()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void EX_I

31、NT1() interrupt 2Count+; /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#define uchar unsigned charuchar T_count=0;sbit LED=P10;void t0Proc() interrupt 1TH0=0x3c;TL0=0xb0;if(+T_count=20)T_count=0;LED=LED;void main()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

32、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#define uchar unsigned charuchar code tab=0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff;uchar i=0;/INT1中断函数void EX_INT1() interrupt 2P0=tabi;P1=tabi;if(+i=8)i=0;/主程序void main()P0=0xff;P1=0x00;EA=1;EX0=1;IT0=1; /下降沿触发while(1);31. 用定时计数器T1定时，由P0控制8

33、个指示灯，首先依次点亮，每个指示灯点亮1秒，8个灯点亮完后，接着是间隔点亮，指示灯点亮0.5秒，上述过程重复循环。Fosc = 12MHz。#include#define uchar unsigned charuchar code tab=0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff,0x00;uchar code tab1=0x01,0x05,0x15,0x55,0x57,0x5f,0x7f,0xff,0x00;uchar T_count=0;uchar i=0;uchar op_type=1;void t1Proc() interrupt 3TH1=0x3

34、c;TL1=0xb0;switch(op_type)case 1:if(+T_count=20) P2=tabi; i=(i+1)%9; T_count=0; if(i=8) i=0;op_type=2; break;case 2:if(+T_count=10) P2=tab1i; i=(i+1)%9; T_count=0; if(i=8) i=0;op_type=1; break;void main()TMOD=0x10;TH1=0x3c;TL1=0xb0;EA=1;ET1=1;TR1=1;P2=0xff;while(1);32. 用定时计数器设计一个二位的计数器，能够将脉冲计数过程数值显示

35、在两个数码管上。#include#define uchar unsigned char#define uint unsigned int/段码uchar code DSY_CODE=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00;uchar Count=0;/T0计数器中断函数void Key_Counter() interrupt 1Count=(Count+1)%100; /因为只有两位数码管，计数控制在100以（0099）/INT0中断函数void Clear_Counter() interrupt 0Count=0;/主程序void main()P0=0x00;P2=0x00;TMOD=0x06; /计数器T0方式2TH0=TL0=256-1; /计数值为1ET0=1; /允许T0中断EX0=1; /允许INT0中断EA=1; /允许CPU中断IP=0x02; /设置优先级，T0高于INT0IT0=1; /INT0中断触发方式为下降沿触发TR0=1; /启动T0while(1)P0=DSY_CODECount/10;P2=DSY_CODECount%10;