本程序所用的原理圖下載:?點這里?，單片機芯片使用的stc89c52；電路找到相應部分即可.這是一整個單片機開發板的電路圖其他的忽略.

本程序的keil工程下載:?http://www.51hei.com/f/miaobiao.rar?? 以下是通過測試的源代碼：

/*

*功能:用定時器0實現秒表,實現60秒定時，精確度為1毫秒

*?? 利用key1獨立按鍵實現定時器的啟動和停止，

*?? 利用key2獨立按鍵實現秒表的清零；

*日期：2013-03-24

*作者：徐冉

*注意事項：若打開兩個定時器時，必須使用兩個定時器，

*???? 否則兩個定時器都不工作！！！

**/

/**********stc89C52-RC 51hei單片機實驗板**********/

/**********51hei-5開發板**********/

#include 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;//蜂鳴器

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,? //熄滅

0x40? //自定義

};

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();

//主函數

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);

}

}

//定時器0初始化函數

void init()

{

TMOD = 0x01;

TH0 = 0xFC;

TL0 = 0x67;

TR0 = 1;

EA = 1;

ET0 = 1;

}

//毫秒位顯示子函數

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);

}

//秒位顯示子函數

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);

}

//延時子函數

void delay(uint xms)

{

uint i, j;

for(i = xms; i > 0; i--)

for(j = 125; j > 0; j--);

}

//獨立按鍵1檢測子函數 ，開啟和關閉

void keyscan_D()

{

if(key1 == 0)

{

delay(10);

if(key1 == 0)

{

TR0 = ~TR0;

FM = 0;

while(!key1);

FM = 1;

}

}

}

//獨立按鍵2檢測子函數，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;

}

}

}

//定時器0中斷子程序

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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