20、 EEPROM memory (AT24C02) (similar to AD)

 EEPROM Memory （AT24C02）： Power down data is also saved

//************EEPROM Memory ***********************************************
unsigned char eeprom_read(unsigned char add)// from EEPROM（ Which address ） Reading data 
{
	unsigned char temp;
	
	IIC_Start();
	IIC_SendByte(0xa0);// Allow writing （ read 1/ Write 0）  1010 000 0/1
	IIC_WaitAck();
	IIC_SendByte(add);// Tell it the address 
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0xa1);// Allow to read （ read 1/ Write 0）  1010 000 0/1
	IIC_WaitAck();
	temp = IIC_RecByte();// Reading data 
	IIC_Stop();
	
	return temp;
	Delayms(5);//（ Read continuously , Write in succession , Only the first one is right ） Need a delay 
}

void eeprom_write(unsigned char add, dat)// Go to EEPROM Writing data （ Where is the writing , What to write ）
{
	IIC_Start();
	IIC_SendByte(0xa0);// Allow writing （ read 1/ Write 0）  1010 000 0/1
	IIC_WaitAck();
	IIC_SendByte(add);// Tell it the address 
	IIC_WaitAck();
	IIC_SendByte(dat);// Write content 
	IIC_WaitAck();
	IIC_Stop();
	Delayms(5);// Need a delay 
}
//***********************************************************************

application ：

    EEPROM_write(0x01,32);// towards 0x01  Write 32
	dat1 = EEPROM_read(0x01);// read 0x01  The data of （dat1 It's a digital tube ）