数字显示00~59按钮1每次按下显示器值加一，按钮2每次按下显示器值减一，按钮3功能零，按钮4启动或停止计时器0
#include<reg52.h> #define uchar unsigned char #define uint unsigned int sbit key1=P3^4; sbit key2=P3^5; sbit key3=P3^6; sbit key4=P3^7; sbit dula=P2^6; sbit wela=P2^7; uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71 }; void delayms(uint); uchar numt0,num; void display(uchar numdis) {uchar shi,ge;shi=numdis/10;ge=numdis%10;dula=1;P0=table[shi];dula=0;P0=0xff;wela=1;P0=0xfe;wela=0;delayms(5);dula=1;P0=table[ge];dula=0;P0=0xff;wela=1;P0=0xfd;wela=0;delayms(5); } void delayms(uint xms) {uint i,j;for(i=xms;i>0;i--)for(j=110;j>0;j--); } void init() {TMOD=0x01;TH0=(65535-45872)/256;TL0=(65536-45872)%256;EA=1;ET0=1; } void keyscan() {if(key1==0){delayms(10);if(key1==0){num++;if(num==60)num=0;while(!key1);}}if(key2==0){delayms(10);if(key2==0){if(num==0)num=60;num--;while(!key2);}}if(key3==0){delayms(10);if(key3==0){num=0;while(!key3);}}if(key4==0){delayms(10);if(key4==0){while(!key4);TR0=~TR0;}} } void main() {init();while(1){keyscan();display(num);} } void T0_timer() interrupt 1 {TH0=(65536-45872)/256;//重装初值TL0=(65536-45872)%256;numt0++;if(numt0==20){numt0=0;num++;if(num==60)num=0;} }
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