单片机时钟秒表代码

{
P0 = table[ge];
dula = 1;
dula = 0;
P0=0x08;
wela = 1;
wela = 0;
delayms(l);
P0 = table[shi]; dula = 1;
dula = 0;
P0=0x04;
wela = 1;
wela = 0;
delayms(1);
P0 = table[bai];
TMOD=0x01;//定时器工作在方式1
ET0=1;//打开定时器、计数器0中断允许位
EA=1;//打开全局中断
//TR0=0;
TH0=(65536-50000)/256;//对TH0 TL0赋值
TL0=(65536-50000)%256;//使定时器0.05秒中断一次
while(1)
{
shi=sec/10;
{
delayms(10);
if(key3==0)
{
TR0=0;
while(!key3);
}
if(key4==0)
{
delayms(10);
if(key4==0)
{
TR0=0;
sec=sec+1;
while(!key4);
}
}
}
void led()
{
LED_CS=1;
P0=0x00;
delayms(250);
0xC0,0xF9,0xA4,0xB0,
0x99,0x92,0x82,0xF8,
0x80,0x90,0x88,0x83, 0xC6,0xA1,0x86,0x8E};
void delay()
{ ;; }
void delayms( uint z)
{
uint x,y;
for(x=z;x>0;x__)
for(y=110;y>0;y--);
delay();
}
void resp on s()
//应答信号:scl为高电平期间,sda被接受设备拉为低电平,最后//scl置0
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i <255))
i++;
scl=0;
delay();
sda=1;
delay();
scl=1;
#in clude<reg52.h>
#defi ne uchar un sig ned char
#defi ne uint un sig ned int
bit write=O; //
sbit sda=P2A3;
sbit scl=P2A2;
sbit dula=P3A6;
sbit wela=P3A7;
sbit LED_CS=P2A5;
sbit MOTOR_CS=P2A7;
sbit key仁PMO；
sbit key2=P1Al;
sbit key3=P1A2;
sbit key4=P1A3;
uint min, sec,tc nt,ge,shi,bai,qia n;
uchar a=0;
uchar flag=O;
uchar code table[]={
ge=sec%10;
bai = mi n%10;
qia n = min/10;
display(qia n,bai,shi,ge);
P0=0xff;
LED_CS=0;
}
void beep()
{
MOTOR_CS=1;
P0 = 0x3f;
delayms(250);
P0 = 0x7f;
MOTOR_CS=0;
}
void mai n()
{
LED_CS = 0;
MOTOR_CS=0;
sec=read_add(2);//读出保存的数据赋于sec
}
void start() //开始信号:scl为高电平期间,sda发生负跳变
{
sห้องสมุดไป่ตู้a=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop() //停止信号:scl为高电平,sda发生正跳变
{
sda=0;
delay();
scl=1;
delay();
sda=1;
{
MOTOR_CS=0;
LED_CS=O;
if(key 1==0)
{
delayms(IO); // if(key1==O)
{
sec=0;
mi n=0;
while(!key1);
}
}
if(key2==0)
{
delayms(10);
if(key2==0)
{
TR0=1;
while(!key2);
}
}
if(key3==0)
1*/ uchar read_byte()
{
uchar i,k;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
scl=1;
delay();
k=(k<<1)|sda;
scl=0;
delay();
}
return k;
}
//数码管显示程序
void display(uchar qia n, uchar bai,uchar shi,uchar ge)
dula = 1;
dula = 0;
P0 = 0x02;
wela= 1;
wela= 0;
delayms(1);
P0 = table[qia n];
dula = 1;
dula = 0;
P0 = 0x01;
wela= 1;
wela= 0; delayms(1);
}
//判断按键
void keysca n()
delay();
}
/*写字节数据：将8位数据通过左移到CY(进位),然后赋值给数据线SDA每发送一位,scl出现正跳变，发送完数据后，需要将scl置0,sda置1*/
void write_byte(uchar date)
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl=0;
delay();
sda=CY;
delay();
scl=1;
delay();
}
scl=0;
delay();
sda=1;
delay();
}
/*读字节数据：将数据一位一位从sda中获取,每读取一位scl出现负跳变 通过变量k将8位数据整合为1个字节数据,读数据前,先将scl置0,sda置