Patent ID: 7984223

Claim:
An information device packaged in one package, comprising: a main function unit including a main processing circuit for executing signal processing related to a main function in said information device and a first microcomputer for controlling said main processing circuit by executing a first firmware program; and an interface function unit including a first interface circuit for receiving data from an exterior device located outside of said information device to provide to said main function unit, a second interface circuit for performing an authentication operation with the exterior device, a second microcomputer for controlling said first interface circuit, and a memory for storing a second firmware program for controlling said first interface circuit, wherein said second microcomputer downloads said second firmware from said memory by executing a download program, and controlling said authentication operation of said second interface circuit, wherein said interface function unit is subjected to a single-chip process separately from said main function unit, wherein said first interface circuit and said second microcomputer are connected to each other by using a parallel interface, and wherein said first interface circuit is an interface circuit conforming to HDMI (High-Definition Multimedia Interface).