练手学习，仅供参考
sbit a0=ACC^0;//定义ACC的位，利用ACC操作速度最快
sbit a1=ACC^1;
sbit a2=ACC^2;
sbit a3=ACC^3;
sbit a4=ACC^4;
sbit a5=ACC^5;
sbit a6=ACC^6;
sbit a7=ACC^7;
void s24(void)
{
_nop_();scl=0;sda=1;scl=1;_nop_();sda=0;_nop_();scl=0;
}
void s240(void)
{
_nop_();scl0=0;sda0=1;scl0=1;_nop_();sda0=0;_nop_();scl0=0;
}
void p24(void)
{
sda=0;scl=1;_nop_();sda=1;
}
void p240(void) {
sda0=0;scl0=1;_nop_();sda0=1;
}
unsigned char rd24(void)
{
sda=1;
scl=1;a7=sda;scl=0;
scl=1;a6=sda;scl=0;
scl=1;a5=sda;scl=0;
scl=1;a4=sda;scl=0;
scl=1;a3=sda;scl=0;
scl=1;a2=sda;scl=0;
scl=1;a1=sda;scl=0;
scl=1;a0=sda;scl=0;
sda=1;scl=1;scl=0;
return(ACC);
}
void wd24(unsigned char dd)
{
ACC=dd;
sda=a7;scl=1;scl=0;
sda=a6;scl=1;scl=0;
sda=a5;scl=1;scl=0;
sda=a4;scl=1;scl=0;
sda=a3;scl=1;scl=0;
sda=a2;scl=1;scl=0;
sda=a1;scl=1;scl=0;
sda=a0;scl=1;scl=0;
sda=1;scl=1;
}
unsigned char read(unsigned int address)
{
unsigned char dd;
dd=((address&0x7ff)/256)<<1;
s24();wd24(0xa0|dd);scl=0;wd24(address);scl=0;
s24();wd24(0xa1|dd);scl=0;dd=rd24();p24();return(dd);
}
void write(unsigned int address,unsigned char dd)
{
unsigned char ddd;
ddd=((address&0x7ff)/256)<<1;
s24();wd24(0xa0|ddd);scl=0;wd24(address);scl=0;wd24(dd);scl=0;p24();
time=0; //time为定时器时间参考，time增加1代
//表1ms,如果没有用定时器，取消该行
while (1)
{
s24();
wd24(0xa0|ddd);
sda=1;
if (sda==0) break;
if (time>10) break; //此行防止由于eeprom器件损坏后的死循环
scl=0;
}
}
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