- #include <reg52.h>
- sbit ADDR0 = P1^0;
- sbit ADDR1 = P1^1;
- sbit ADDR2 = P1^2;
- sbit ADDR3 = P1^3;
- sbit ENLED = P1^4;
- //用数组来存储数码管的真值表，数组将在下一章详细介绍
- unsigned char code LedChar[] = {
- 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
- 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
- };
- void main(){
- unsigned char cnt = 0; //记录 T0 中断次数
- unsigned char sec = 0; //记录经过的秒数
- ENLED = 0; //使能 U3，选择数码管 DS1
- ADDR3 = 1;
- ADDR2 = 0;
- ADDR1 = 0;
- ADDR0 = 0;
- TMOD = 0x01; //设置 T0 为模式1
- TH0 = 0xB8; //为 T0 赋初值 0xB800
- TL0 = 0x00;
- TR0 = 1; //启动 T0
- while (1){
- if (TF0 == 1){ //判断 T0 是否溢出
- TF0 = 0; //T0 溢出后，清零中断标志
- TH0 = 0xB8; //并重新赋初值
- TL0 = 0x00;
- cnt++; //计数值自加1
- if (cnt >= 50){ //判断 T0 溢出是否达到50次
- cnt = 0; //达到50次后计数值清零
- P0 = LedChar[sec]; //当前秒数对应的真值表中的值送到 P0 口
- sec++; //秒数记录自加1
- if (sec >= 16){ //当秒数超过 0x0F(15)后，重新从0开始
- sec = 0;
- }
- }
- }
- }
- }
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