辽宁科技大学单片机考试题库

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1、1第一题#includesbitP1_0=P1^0;sbitP1_1=P1^1;sbitP1_2=P1^2;sbitP1_3=P1^3;sbitP1_7=P1^7;unsignedcharID;voiddelayms(unsignedchari){unsignedcharj;for(i;i>0;i--)for(j=1000;j>0;j--);}voidmain(void){while(1){if(P1_7==0){delayms(100);if(P1_7==0){ID++;if(ID==4){ID=0;}while(P1_

2、7==0);}}switch(ID){case0:P1_0=~P1_0;P1_1=1;P1_2=1;P1_3=1;delayms(100);break;case1:P1_1=~P1_1;P1_0=1;P1_2=1;P1_3=1;delayms(100);break;case2:P1_2=~P1_2;P1_0=1;P1_1=1;P1_3=1;delayms(100);break;case3:P1_3=~P1_3;P1_0=1;P1_1=1;P1_2=1;delayms(100);break;}}}2.串行通信#include

3、#include#defineucharunsignedcharucharcodeTable[18]={1,3,7,0x0f,0x1F,0x3F,0x7F,0xff,0xFE,0xFC,0xF8,0xF0,0xE0,0xC0,0x80,0,0xFF,00};voidDelay(unsignedinttime);voidmain(){unsignedinti,a;TMOD=0x20;TL1=0xF4;TH1=0xF4;TR1=1;PCON=0x00;SCON=0x50;while(1){for(i=0;i<18;i++){

4、SBUF=Table[i];while(TI!=1);/*发送数据完成标志*/TI=0;/*清除发送标志*/while(RI!=1);/*接收到数据标志*/RI=0;/*清除接收标志*/a=SBUF;/*接收数据*/P1=a;Delay(200);/*彩灯状态保持一段时间*/}}}voidDelay(unsignedintx){uchari;while(x--){for(i=0;i<125;i++){;}}}3.五人表决器#includesbitRST=P1^7;sbitK1=P1^0;sbitK2=P1^1;sbitK3

5、=P1^2;sbitK4=P1^3;sbitK5=P1^4;sbitled=P1^6;unsignedcharcount;voiddelay(unsignedk){unsignedinti,j;for(i=0;i

6、}elseif(K3==0){delay(40);if(K3==0){while(K3==0);count++;P1=0xFF;}}elseif(K4==0){delay(40);if(K4==0){while(K4==0);count++;P1=0xFF;}}elseif(K5==0){delay(40);if(K5==0){while(K5==0);count++;P1=0xFF;}}if(count>=3){led=~led;delay(200);}if(RST==0){delay(40);if(RST==0){count=0;P1=

7、0xFF;}}}}4.A/D转换法一#include#include#defineCS273XBYTE[0xCFA0]#defineIN7XBYTE[0xCFAF]voidDelay(intU);voidDisplay();unsignedcharcodetable[17]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x00};unsignedBUF[2]={0,0};unsigned

8、chark,sn;voidmain(){unsignedchari;IE=0x81;IT0=1;while(1){IN7=i;sn=1;while(sn);Display();}