本程序所用的原理图下载: 点这里 ，单片机芯片使用的stc89c52；电路找到相应部分即可.这是一整个单片机的电路图其他的忽略. 本程序的keil工程下载: http://www.51hei.com/f/miaobiao.rar 以下是通过测试的源代码：
/* *功能:用定时器0实现秒表,实现60秒定时，精确度为1毫秒 * 利用key1独立按键实现定时器的启动和停止， * 利用key2独立按键实现秒表的清零； *日期：2013-03-24 *作者：徐冉 *注意事项：若打开两个定时器时，必须使用两个定时器， * 否则两个定时器都不工作！！！ **/ /**********stc89C52-RC 51hei单片机实验板**********/ /**********51hei-5开发板**********/ #include <reg52.h> typedef unsigned int uint; typedef unsigned char uchar; sbit wela = P2^7; sbit dula = P2^6; sbit key1 = P3^4; sbit key2 = P3^5; sbit FM = P2^3;// uchar code table[] = { 0x3F, //"0" 0x06, //"1" 0x5B, //"2" 0x4F, //"3" 0x66, //"4" 0x6D, //"5" 0x7D, //"6" 0x07, //"7" 0x7F, //"8" 0x6F, //"9" 0x77, //"A" 0x7C, //"B" 0x39, //"C" 0x5E, //"D" 0x79, //"E" 0x71, //"F" 0x76, //"H" 0x38, //"L" 0x37, //"n" 0x3E, //"u" 0x73, //"P" 0x5C, //"o" 0x40, //"-" 0x00, //熄灭 0x40 //自定义 }; uint counter, num_h, num_m; void delay(uint xms); void display_h(uint num_h); void init(); void display_m(uint num_m); void keyscan_D(); void keyscan_Q(); //主函数 void main() { init(); while(1) { dula = 1; P0 = table[22]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xfb; wela = 0; keyscan_D(); keyscan_Q(); display_h(num_h); display_m(num_m); } } //定时器0初始化函数 void init() {
TMOD = 0x01; TH0 = 0xFC; TL0 = 0x67; TR0 = 1; EA = 1; ET0 = 1; } //毫秒位显示子函数 void display_h(uint num_h) { uchar bai,shi,ge; bai = num_h / 100 % 10; shi = num_h / 10 % 10; ge = num_h % 10; dula = 1; P0 = table[bai]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xf7; wela = 0; P0 = 0x00; delay(1); dula = 1; P0 = table[shi]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xef; wela = 0; P0 = 0x00; delay(1); dula = 1; P0 = table[ge]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xdf; wela = 0; P0 = 0x00; delay(1); } //秒位显示子函数 void display_m(uint num_m) { uchar shi_, ge_; shi_ = num_m / 10 % 10; ge_ = num_m % 10; dula = 1; P0 = table[shi_]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xfe; wela = 0; P0 = 0x00; delay(1); dula = 1; P0 = table[ge_]; dula = 0; P0 = 0xff; wela = 1; P0 = 0xfd; wela = 0; P0 = 0x00; delay(1); } //延时子函数 void delay(uint xms) { uint i, j; for(i = xms; i > 0; i--) for(j = 125; j > 0; j--); } //独立按键1检测子函数 ，开启和关闭 void keyscan_D() { if(key1 == 0) { delay(10); if(key1 == 0) { TR0 = ~TR0; FM = 0; while(!key1); FM = 1; } } } //独立按键2检测子函数，清零 void keyscan_Q() { if(key2 == 0) { delay(10); if(key2 == 0) { counter = 0; num_h = 0; num_m = 0; FM = 0; while(!key2); FM = 1; } } } //定时器0中断子程序 void int_time0() interrupt 1 { TH0 = 0xFC; TL0 = 0x67; counter++; if(counter == 1) { counter = 0; num_h++; //毫秒自增 if(num_h == 1000) { num_h = 0; num_m++; //秒自增 if(num_m == 60) { num_m = 0; } } } }
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