Office facilities are always fundamental to business. To save manpower and promote efficiency, more and more user-friendly office equipment have been introduced, and one of the most brilliant device is the multi-functional peripheral (MFP) that integrates copier, printer, scanner and fax machine. It also supports networking, which brings risks of privacy leakage. To eliminate such risks and guarantee stable operation, microcontrollers are used to manage communication and collaboration among functional modules by executing complex instructions with the help of its programmability and powerful processing and control capabilities.