这是介绍MCU掉电保护电路的设计方案，可以好好看看，对自己做保护设计很有用-This is to introduce the MCU power-off protection circuit design, you can have a good look, and self-protection design is useful to do

自制电子密码锁程序，不能实现掉电保护功能-Self-made electronic code lock procedure can not be achieved power-down protection