这个程序主要是讲解24C02这个外部存储芯片的使用。程序有两部分组成，第一部分是讲解对24C02这个芯片进行写入。第二部分是对24C02这个芯片进行读取。即实现对对24C02的读取和写入操作，也即实现了对24C02的一个最基本的操作，可以把这部分的程序进行扩展，应用到不同的场景下，但是，最基本还是要懂得对24C02的读写操作。-This program is mainly to explain the use of external memory 24C02 chip. Program consists of two parts, the first part is to explain to the 24C02 chip for writing. The second part is the 24C02 chip for reading. Namely to achieve 24C02 read and write operations, that the realization of a basic operation of the 24C02, this part of the program may be extended, applied to different scenarios, but still want to know the most basic of 24C02 read and write operations.