单片机程序怎么修改设置好对应时间,等待10s左右自动倒计时,不用按键触发倒计时 -

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar min,sec,count,sec1,sec2,min0,min1,min2,keystopc,temp;
sbit keystop=P3^0;
sbit keyh=P3^1;
sbit keym=P3^2;
sbit keys=P3^3;
sbit lcden=P3^4;
sbit lcdrw=P3^6;
sbit lcdrs=P3^5;
uchar code table[]={'0','1','2','3','4','5','6','7','8','9',':'};
void init() //定时器初始化
{
count=0;
min=0;
sec=59;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=0;
ET0=1;
EA=1;
}
void delay(uint z) //延时程序
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/**************************************************************
------LCD1602显示函数------
*************************************************************/
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_data(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init_1602() //初始化1602
{
lcden=0;
lcdrw=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80);
}
void write_Char(unsigned char x,unsigned char y,unsigned char date)
{
if (y == 0)
{
write_com(0x80 + x);
}
else
{
write_com(0xC0 + x);
}
write_data(date);
}
void display(uchar min0,uchar min1,uchar min2,uchar sec1,uchar sec2) //显示程序
{
write_Char(3,0,table[min0]);
write_Char(4,0,table[min1]);
write_Char(5,0,table[min2]);
write_Char(6,0,table[0x0a]);
write_Char(7,0,table[sec1]);
write_Char(8,0,table[sec2]);
}
/************************************************************
------计时器/定时器0-----
*************************************************************/
void count0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++;
if(count==20)
{
count=0;
if(sec==0)
{
if (min!=0)
{
sec=59;
min--;
}
}
else sec--;
}
}
/************************************************************
------主函数------
*************************************************************/
void main()
{
init();
init_1602();
while(1)
{
if(keystop==0) //检测是否停止键按下
{
delay(10);
if(keystop==0)
{
if(keystopc!=1) keystopc++; //按停止键的次数
else keystopc=0;
while(keystop==0); //松手检测
delay(5);
while(keystop==0);
}
switch(keystopc)
{
case 1:TR0=0;break; // 按键一次就停止计数
case 0:TR0=1;break;
default:break;
}
}
if(keyh==0) //实现小时加一
{
delay(50);
if(keyh==0)
{
if(min!=110)
{
min++;
}
}
while(!keym); //松手检测
delay(5);
while(!keym);
}
if(keym==0) //实现分钟加一
{
delay(100);
if(keym==0)
{
if(min!=0)
{
min--;
}
}
while(!keyh); //松手检测
delay(5);
while(!keyh);
}
min0=min/100;
min1=min%100/10;
min2=min%10;
sec1=sec/10;
sec2=sec%10;
display(min0,min1,min2,sec1,sec2); //一直显示时钟
}
}

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