1602和24C02芯片一起编写时钟发生器程序，1602主要用于显示，2402用于随时储存数据， 使得断电后数据能够保存 上电后能继续走动-1602 and 24C02 chip clock generator with the writing process, mainly for 1602 show that 2402 is used to store data at any time, so the data can be saved after power off after pow