STC 单片机，开机后LED显示当前的变量值,变量从0开始递增，掉电后，变量自动保存到EEPROM中,下次开机led显示保存的变量值。-STC microcomputer, after power LED displays the current value of the variable, the variable increases from 0, powered off, the variable is automatically saved to the EEPROM, the next boot led display the saved variable.