定时器中断设计秒钟

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1、/*用定时器设计一个秒表00-59；开始显示00按下key1加1，key2减1，key3清零key4启动暂停按钮*/#include#include#defineucharunsignedchar#defineuintunsignedintsbitkey1=P3^0;sbitkey2=P3^1;sbitkey3=P1^5;sbitkey4=P1^6;sbitwe0=P3^4;sbitwe1=P3^5;sbitwe2=P3^6;sbitwe3=P3^7;sbitled0=P2^0;sbitled1=P2^1;sbitled2=P2^2;sbitled

2、3=P2^3;sbitled4=P2^4;sbitled5=P2^5;sbitled6=P2^6;sbitled7=P2^7;ucharcodetable[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x07f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//0123456789ABCDEFucharm,n;charnum;voiddelayms(uintx){uinti,j;for(i=x;i>0;i--)for(j=240;j>0;j--);}voidinit(){num=0;TMOD=0x01;//定时器0工作方

3、式1TH0=(65536-50000)/256;//装入初值50msTL0=(65536-50000)%256;EA=1;//开总中断ET0=1;//开定时器0中断//TR0=1;//启动定时器0中断}voiddisplay(){ucharshi,ge;shi=num/10;ge=num%10;we3=0;P0=0xff;P0=~table[shi];delayms(1);we3=1;we2=0;P0=0xff;P0=~table[ge];delayms(1);we2=1;}keyscan(){if(key1==0){delayms(5);if(key1==0){led3=0;num++

4、;if(num==60)num=0;while(!key1);}led3=1;}if(key2==0){delayms(5);if(key2==0){led2=0;num--;if(num==-1)num=59;}while(!key2);led2=1;}if(key3==0){delayms(5);if(key3==0){led1=0;num=0;}while(!key3);led1=1;}if(key4==0){delayms(5);if(key4==0){led0=0;TR0=~TR0;}}while(!key4);led0=1;}voidmain(){init();while(1

5、){keyscan();display();}}voidtimer0()interrupt1{TH0=(65536-50000)/256;//装入初值50msTL0=(65536-50000)%256;n++;if(n==20){n=0;num++;if(num==60){num=0;}}}