单片机上机操作考试题及答案.docx

1、单片机上机操作考试题及答案单片机上机考试试题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 int count=0;int minute=0;int temp;char code style8=0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe;void desplay() temp=minute%8; P0= styletemp;void toProc() interrupt 1 count+; TH0=0x0c; TL0=0x78;void main() TMOD=0; TH0=0x0c; TL0=0x7

2、8; TR0=1; ET0=1; EA=1; while(1) if(count=100) minute+; count=0; desplay(); 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 char code style4=0x0,0xf0,0x33,0xff;sbit P1_0=P10;sbit P1_1=P11;void main() P0=0xff; while(1) if(P1_0=0&P1_

3、1=0) P0=style0; if(P1_0=0&P1_1=1) P0=style1; if(P1_0=1&P1_1=0) P0=style2; if(P1_0=1&P1_1=1) P0=style3; 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 char code style5=0x89,0x86,0xc7,0xc7,0xc0;int i;int count=0;int second=0;void t0Pro() interrupt 1 count+; TL0=0xB0; TH0=0x3c; void display() i=sec

4、ond%5; P0=stylei; void main() TMOD=0x01; EA=1; TR0=1; ET0=1; TL0=0xB0; TH0=0x3c; while(1) if(count=20) second+; count=0; display(); 4.在6个数码管上分别显示自己学号的后六位数字。 #includechar code code1=0x4f,0x4f,0x01,0x06,0x06,0x4f;sbit p1_0=P10;char num;void delay(int timer) while(timer) -timer; void main() int i; whil

5、e(1) num =0xFE; for(i=0;i6;i+) P1=num; P2=code1i; delay(1000); num=(num1)|1; 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#includestdio.hint count;count=0;void t0Proc() interrupt 1 TH0=0x3c; TL0=0xb0; count+; if(count=10) P0=P0+1; count=0; if(P0=0xff) P0=0xe1; void main() EA=1; ET0=1; TMOD=1; TH0=0x3

6、c; TL0=0xb0; TR0=1; P0=0xe1; while(1); 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 /sbit k1=P20; int count=0;void delay(unsigned char i); void int0Proc() interrupt 0 count+; P1=0xf0;void main() EA=1; EX0=1; IT0=1; P1=0xcc; while(1) if(count%2=0)

7、if(P1=0xcc) P1=0x30; delay(500); else P1=0xcc; delay(500); void delay(unsigned char i) unsigned char j,k; for(k=0;ki;k+) for(j=0;j255;j+); 7.通过A/D转换电路，将模拟电压值在两个发光二极管上显示出来。（查询和中断方式均可）#include#include#define a XBYTE0xcfa8sbit p=P32;sbit shi=P34;sbit ge=P35;void sepr(unsigned char w);void disp();unsign

8、ed char i,x,chh,chl;void main() while(1) adc0809=0; while(p); x=adc0809; sepr(x); disp();void sepr(unsigned char w)unsigned char ch;ch=w;chh=ch/51;ch=ch%51;,chl=(ch*10)/51;void disp()unsigned char led1=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;unsigned char led2=0xbf,0x86,0xdb,0xcf,0xe6,0xed

9、,0xfd,0x87,0xff,0xef ;shi=0;ge=1;a=led2chh;for(i=0;i50;i+);shi=1;ge=0;a=led1chl;for(i=0;i50;i+);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 char code style4=0x0f,0xf0,0xcc,0xff;int i;int count=0;int second=0;void t0Pro() interrupt 1 count+; TL0=0xB0; TH0=0x3c; void d

10、isplay() i=second%4; P0=stylei; void main() TMOD=0x01; EA=1; TR0=1; ET0=1; TL0=0xB0; TH0=0x3c; while(1) if(count=40) second+; count=0; display(); 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 char code style3=0xc0,0xf9,0x92;int i;int count=0;int second=0;void t0Pro() interrupt 1 count+; TL0=0xB0;

11、TH0=0x3c; void display() i=second%3; P0=stylei; void main() TMOD=0x01; EA=1; TR0=1; ET0=1; TL0=0xB0; TH0=0x3c; while(1) if(count=20) second+; count=0; display(); 10.在4个数码管上稳定显示出“A” “C” “E” “P” 四个字符。#include char code style4=0x88,0xc6,0x86,0x8c;void main() while(1) P0=style0; P2=style1; P3=style2; P1

12、=style3; 11.试采用定时方式2，在P1.0引脚上输出频率为1KHz的方波 （可能有问题）#includeint count;count=0;sbit p1_0=P10;void t0Proc() interrupt 1 p1_0=p1_0; void main() EA=1; ET0=1; TMOD=2; TH0=0x06; TL0=0x06; TR0=1; p1_0=1; while(1); 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 #define uchar unsigned char #define

13、uint unsigned int uint count = 0; uchar i; /0-9段码 uchar code time = 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90; void Stop() interrupt 2 /INT1中断 ET0 = 1; TR0 = 1; void Start() interrupt 0 /INT0中断 ET0 = 0; TR0 = 0; void Timer() interrupt 1 /T0中断 TH0=(65536 - 50000) / 256; /恢复定时器0 初值 TL0=(65536

14、- 50000) % 256; if(+i = 20) /50ms*20=1s 转换状态 i=0; count+; P0=timecount/10; P1=timecount%10; if(count=20) count=0; /满20s后显示00 void main() /初始显示00 P0 = 0xc0; P1 = 0xc0; /T0采用方式1 TMOD=0x01;/中断总开关 EA = 1; EX0 = 1; EX1 = 1; IT0 = 1; IT1 = 1;/INT0优先 PX0 = 1; while(1); 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

15、时间为1s，有按键按下时，8个发光二极管全部熄灭。#includestdio.h#includereg51.hint count=0;void interINT1() interrupt 2P0=0xff;ET0=0;TR0=0;void interT0() interrupt 1if(count=15)TH0=0xBD;TL0=0xC0;P0=(P01)|1;if(P0=0xff)P0=0xfe;count=0;count+;void main()EA=1;ET0=1;TR0=1;TMOD=0x01;TH0=0xBD;TL0=0xC0;P0=0xfe;while(1) if(P33=0) E

16、X1=1; IT1=1; 15.通过串口控制单片机产生1KHz的波型，当PC通过串口发过来“K”时，开始产生波型，当发过来“S”时，停止产生波型，fosc=12MHz。（没答案）15.通过A/D转换电路，将模拟电压值在两个发光二极管上显示出来。（查询和中断方式均可）#include#include#define a XBYTE0xcfa8sbit p=P32;sbit shi=P34;sbit ge=P35;void sepr(unsigned char w);void disp();unsigned char i,x,chh,chl;void main() while(1) adc0809=

17、0; while(p); x=adc0809; sepr(x); disp();void sepr(unsigned char w)unsigned char ch;ch=w;chh=ch/51;ch=ch%51;,chl=(ch*10)/51;void disp()unsigned char led1=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;unsigned char led2=0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef ;shi=0;ge=1;a=led2chh;for(i=

18、0;i50;i+);shi=1;ge=0;a=led1chl;for(i=0;i0) time-; void main() /P1=0xaa; while(1) if(p0_0=0) if(p0_1=0) P1=0X00; delay(); else if(p0_1=1) P1=0X0f; delay(); else if(p0_0=1) if(p0_1=0) P1=0Xf3; delay(); else if(p0_1=1) P1=0Xaa; delay(); 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

19、环P1.0P1.1P1.2状态1状态2状态3#includestdio.h #includereg51.hint count=0;int flag=0;void first() P1=0x02; flag=0; TH0=0xBD; TL0=0xC0;void interT0() interrupt 1 P1=0x02; if(flag=0) if(count=15) flag=1; count=0; TH0=0xBD; TL0=0xC0; count+; else if(flag=1) P1=0x01; if(count=15) TH0=0xBD; TL0=0xC0; if(count=30)

20、 flag=2; count=0; TH0=0xBD; TL0=0xC0; count+; else if(flag=2) P1=0x04; if(count=15) TH0=0xBD; TL0=0xC0; if(count=30) TH0=0xBD; TL0=0xC0; if(count=45) first(); count=0; count+; void main() EA=1; TMOD=1; ET0=1; TR0=1; first(); 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

21、.#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_count=0;uchar i=1;void t0Proc() interrupt 1 TH0=0x3c; TL0=0xb0; switch(State) case 0: if(+T_count=20) P0=tabi; i=(i+1)%8; i

22、f(i=7) State=1; T_count=0; break; case 1: if(+T_count=15) i=(i+1)%8; P0=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; P0=tab0; while(1);19在4个数码管上显示出当天的日期。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0xc0,0xb0,0xc0,0x92;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P1.0P1.1P1.2P1.3状