AT24C02 程序详解

#include<reg52.h>
#define uchar unsigned char     
#define uint unsigned int
sbit SDA=P3^5;
sbit SCL=P3^4;
sbit DL=P2^6;
sbit WL=P2^7;
sbit K=P2^1;
uchar a,t,flag,shi,ge;
uchar code table[]={0x3f,0x06,0x5b,0x4f,
                             0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x00};
void delayms(uint z)            
{
uint x,y;
for(x=110;x>0;x--)
  for(y=z;y>0;y--);
}

void delay()
{
;  ;
}

void start()  
{
SDA=1;
delay();

SCL=1;
delay();
SDA=0;
delay();
}

void stop()   
{
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
delay();
}

void respons()
{
uchar i;
SCL=1;
delay();
while((SDA==1)&&(i<250))
i++;
SCL=0;
delay();
}

void writebyte(uchar date)
{
uchar i,tran;