片内EEPROM读写实险。 1、用内部EEPROM记录CPU启动次数，并在PB口上显示出来。 2、内部1 M晶振，程序采用单任务方式，软件延时。-Chip EEPROM read and write real risk. 1, using the internal EEPROM to start recording the number of CPU, and in the mouth on PB displayed. 2, internal 1 M crystal, procedures us