Renesas Electronics Corporation

Ntt Docomo, Inc.

Satoshi Akita

Tomohiro Akiyama

Kunio Yoshikawa

Kumiko Yamaguchi

Tetsuhiro Tanno

Tetsuhiro Sasagawa

Kazuaki Gemma

Norihisa Yamamoto

A portable terminal supplies power to a chip card therein with host power off. A power controller supplies power from a battery to a host, the chip card, and a CLF; a first switch opens/closes a power supply channel to the chip card, branching from a power supply channel from the power controller to the host; a second switch opens/closes a power supply channel to the chip card, branching from a power supply channel from the power controller to the CLF; a switch controller opens the first switch and closes the second switch if the CLF detects a contactless RF signal, if the host is off or if the portable terminal is in a low battery mode, and if the contactless RF signal conforms to the communication method of the chip card, and the switch controller closes the first switch and opens the second switch if the host is on.

Portable terminal, recording medium

Growing community of inventors

Kanagawa, Japan

Satoshi Akita