单片机0-99秒表程序+电路（精确到0.1秒） -

#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
sbit key2=P3^0;
sbit key3=P3^1;
sbit key4=P3^2;
sbit key5=P3^3;
sbit DU=P2^6;
sbit WE=P2^7;
uchar secs,sec, msec, usec;
uchar code tabel[]= {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,};
void delay(uint z)
{
uint x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y--);
}
void display(uchar secs,sec,msec)
{
P0 = 0XFF;
WE = 1;
P0 = 0XFE;
WE = 0;
DU = 1;
P0 = tabel[secs];
DU = 0;
delay(5);
P0 = 0XFF;
WE = 1;
P0 = 0XFD;
WE = 0;
DU = 1;
P0 = tabel[sec];
DU = 0;
delay(5);
P0 = 0XFF;
WE = 1;
P0 = 0XFB;
WE = 0;
DU = 1;
P0 = tabel[msec];
DU = 0;
delay(5);
}
void dian()
{
P0 = 0XFF;
WE = 1;
P0 = 0XFD;
WE = 0;
DU = 1;
P0 = 0x80;
DU = 0;
delay(5);
}
void count()
{
if(usec == 10)
{
usec = 0;
msec++;
}
if(msec==10)
{
msec=0;
sec++;
}
if(sec==10)
{
sec=0;
secs++;
}
if(secs==10)
{
TR0=0;
TH0=0XDC;
TL0=0X00;
usec=0;
msec=0;
sec=0;
secs=0;
TR0=1;
}
}
void timer0() interrupt 1
{
TH0=0XDC;
TL0=0X00;
usec++;
count();
}
void init()
{
TMOD=0X01;
TH0=0XDC;
TL0=0X00;
EA=1;
ET0=1;
sec=0;
msec=0;
usec=0;
secs=0;
}
void keyscan()
{
if(key2==0)//判断按键是否按下
{
delay(10);//延时10ms用以消抖
if(key2==0)//按键确实按下
{
while(key2==0)//松手检测
{
display(secs,sec,msec);//还没松手时，不断刷新显示函数，这样数码管就不会不显示
}
TR0=1;//打开定时器0
}
}
if(key3==0)//判断按键是否按下
{
delay(10);//延时10ms用以消抖
if(key3==0)//按键确实按下
{
while(key3==0)//松手检测
{
TR0=0;//关闭定时器0
}
}
}
if(key4==0)//判断按键是否按下
{
delay(10);//延时10ms用以消抖
if(key4==0)//按键确实按下
{
while(key4==0)//松手检测
{
TR0=1;//关闭定时器0
}
}
}
if(key5==0)
{
delay(10);//延时10ms消抖
if(key5==0)//zero按键确实按下
{
TR0=0;//关闭定时器0
while(key5==0)//松手检测
{
display(secs,sec,msec);//还没松手时，不断刷新显示函数，这样数码管就不会不显示
}
TH0=0; //重新装初值
TL0=0;
sec=0;//初始化一下变量为默认的数值（0）；
msec=0;
usec=0;
secs=0;
}
}
}
void main()
{
init();
while(1)
{ dian();
keyscan();
display(secs,sec,msec);
}
}

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