51单片级的FLASH操作掉电保存数据；此程序是GPS模拟串口接收，在1602上显示，并且可保存掉电前的数据，用串口调试助手可以模拟那个GPS协议（4800波特率）-FLASH 51 single-level power-down operation save the data this process is simulated serial GPS receiver, the 1602 show, and save the data before power-down, with seria