//1.
#include <reg52.h>sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;sbit ADDR2 = P1^2;sbit ADDR3 = P1^3;sbit ENLED = P1^4;unsigned char code LedChar[] = { //数码管显示字符转换表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E};unsigned char LedBuff[6] = { //数码管显示缓冲区,初值0xFF确保启动时都不亮 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};unsigned char i = 0; //动态扫描的索引unsigned int cnt = 0; //记录T1中断次数unsigned char flag1s = 0; //1秒定时标志void main()
{ char j; //循环变量 unsigned long sec = 1000000; //记录经过的秒数,倒计时初值为999999+1 unsigned char buf[6]; //中间转换缓冲区EA = 1; //使能总中断
ENLED = 0; //使能U3 ADDR3 = 1; //因为需要动态改变ADDR0-2的值,所以不需要再初始化了 TMOD = 0x10; //设置T1为模式1 TH1 = 0xFC; //为T1赋初值0xFC67,定时1ms TL1 = 0x67; ET1 = 1; //使能T1中断 TR1 = 1; //启动T1 while (1) { if (flag1s == 1) //判断1秒定时标志 { flag1s = 0; //1秒定时标志清零 sec--; //秒计数自减1 //将sec按十进制位从低到高依次提取到buf数组中 buf[0] = sec%10; buf[1] = sec/10%10; buf[2] = sec/100%10; buf[3] = sec/1000%10; buf[4] = sec/10000%10; buf[5] = sec/100000%10; //从最高为开始,遇到0不显示,遇到非0退出循环 for (j=5; j>=1; j--) { if (buf[j] == 0) LedBuff[j] = 0xFF; else break; } //将剩余的有效数字位如实转换 for ( ; j>=0; j--) //for()起始未对j操作,j即保持上个循环结束时的值 { LedBuff[j] = LedChar[buf[j]]; } } }}/* 定时器1中断服务函数 */void InterruptTimer1() interrupt 3{ TH1 = 0xFC; //重新加载初值 TL1 = 0x67; cnt++; //中断次数计数值加1 if (cnt >= 1000) //中断1000次即1秒 { cnt = 0; //清零计数值以重新开始下1秒计时 flag1s = 1; //设置1秒定时标志为1 } //以下代码完成数码管动态扫描刷新 P0 = 0xFF; //显示消隐 switch (i) { case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=LedBuff[0]; break; case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=LedBuff[1]; break; case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=LedBuff[2]; break; case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=LedBuff[3]; break; case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=LedBuff[4]; break; case 5: ADDR2=1; ADDR1=0; ADDR0=1; i=0; P0=LedBuff[5]; break; default: break; }}
//2.
//#include <reg52.h>
//sbit ADDR0=P1^0;//sbit ADDR1=P1^1;//sbit ADDR2=P1^2;//sbit ADDR3=P1^3;//sbit ENLED=P1^4;//unsigned char code LedChar[]={ // 0x90,0x80,0xF8,0x82,0x92,0x99,0xB0,0xA4,0xF9,0xC0//};//unsigned char LedBuff[6]={ // 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF//};//unsigned char i=0;//unsigned int cnt=0;////void main1()// { // unsigned char sec=0;// unsigned int a=0;// EA=1;// ENLED=0;// ADDR3=1;// TMOD=0x01;// TH0=0xFC;// TL0=0x67;//// ET0=1;// TR0=1;//// while(1)// { // if(cnt>=1000)// { // cnt=0;// sec++ ;// LedBuff[0]=LedChar[sec%10];// LedBuff[1]=LedChar[sec/10%10];// LedBuff[2]=LedChar[sec/100%10];// LedBuff[3]=LedChar[sec/1000%10];// LedBuff[4]=LedChar[sec/10000%10];// LedBuff[5]=LedChar[sec/100000%10];// }// // }//// }// void InterruptTimer() interrupt 1// { // TH0=0xFC;// TL0=0x67;// cnt++;//// P0=0xFF;//// switch (i)// { // case 0:ADDR2=0;ADDR1=0;ADDR0=0;i++;P0=LedBuff[0];break;// case 1:ADDR2=0;ADDR1=0;ADDR0=1;i++;P0=LedBuff[1];break;// case 2:ADDR2=0;ADDR1=1;ADDR0=0;i++;P0=LedBuff[2];break;// case 3:ADDR2=0;ADDR1=1;ADDR0=1;i++;P0=LedBuff[3];break;// case 4:ADDR2=1;ADDR1=0;ADDR0=0;i++;P0=LedBuff[4];break;// case 5:ADDR2=1;ADDR1=0;ADDR0=1;i=0;P0=LedBuff[5];break;// default: break;// }// // }