说明：  AT24C256是一个32Kflash的外部存储芯片，由I2C总线通信，它支持字节和页写入，可作为单片机系统扩展的存储芯片使用。本篇文章列举了一个例子，说明如何使用这类芯片和规划文件管理
(AT24C256 is a 32Kflash external memory chips, by the I2C bus communications, it supports byte and page write, can be used as single-chip microcomputer system to expand the use of the memory chips. This article cited an example to illustrate how the use of such chips and planning document management)