Portable information device

Abstract

A portable information device having a central processing unit and a power source coupled to the central processing unit and driving the central processing unit, comprises: an external control system circuit provided between the power source and the central processing unit, and providing power supply from the power source to the central processing unit by an external input; and an autonomous control system circuit providing power supply from the power source to the central processing unit under control of the central processing unit; the external control system circuit and the autonomous control system circuit being coupled in parallel with each other, the external control system circuit including a mechanical switch turned on and off by an external input, and the autonomous control system circuit including a transistor switch turned on and off under control of the central processing unit.

Dependencies are inferred from the claim text.