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