说明：  8051单片机串行读写EEPROM，24C02，本案例采用汇编编写。打包成函数，可直接调用。适合初学者学习。
(8051 serial read and write EEPROM, 24C02, compilation of the preparation used in this case. Packaged into a function, can be directly invoked. Suitable for beginners to learn.)