//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;
// }
//
// }