模拟I2C中， 24lc256 问题

sirriam

unsigned char EEPROM_ByteWrite(unsigned int addr,unsigned char data)
{
unsigned char Dev_addr; //设备地址
unsigned char AddrLow;
unsigned char AddrHigh;
AddrLow = (unsigned char)addr;
AddrHigh = (unsigned char)(addr>>8);
Dev_addr = 0xa0|(AddrHigh<<1);
i2c_start();
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrHigh);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrLow);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(data);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_stop();
i2c_delay_ms(10);
return 0;
}

问题：为什么设备地址要 Dev_addr = 0xa0|(AddrHigh<<1);  

gfy200866

建议看I2C的读写基本时序。多看几遍必然能明白的。