What technical field does the patent of using single chip microcomputer control belong to?

If it is something that makes you move, it belongs to automatic control (for example, it involves control methods and declares invention patents);

If you let what you can't move move move by yourself, it belongs to automation;

If people already have control means and methods, if you change it into a single chip microcomputer, it belongs to the application technology of single chip microcomputer.