Hitachi Ulsi Systems Co., Ltd.

Renesas Electronics Corporation

Renesas Technology Corp.

Masatoshi Takahashi

Hiroshi Watase

Toshihiro Tanaka

Yutaka Shinagawa

Kozo Katayama

Takanori Yamazoe

Takashi Tsukamoto

Kunihiko Nakada

Takeo Kanai

Nobutaka Nagasaki

Yuuichirou Nariyoshi

Chiaki Tanimoto

Shigeo Hirabayashi

A semiconductor processing device according to the invention includes a first non-volatile memory () for erasing stored information on a first data length unit, a second non-volatile memory () for erasing stored information on a second data length unit, and a central processing unit (), and capable of inputting/outputting encrypted data from/to an outside. The first non-volatile memory is used for storing an encryption key to be utilized for encrypting the data. The second non-volatile memory is used for storing a program to be processed by the central processing unit. The non-volatile memories to be utilized for storing the program and for storing the encryption key are separated from each other, and the data lengths of the erase units of information to be stored in the non-volatile memories are defined separately. Therefore, the stored information can efficiently be erased before the execution of a processing of writing the program, and the stored information can be erased corresponding to the data length of a necessary processing unit in the write of the encryption key to be utilized in the calculation processing of the CPU.

Semiconductor processing device and IC card

Disclosed herein are an IC card and a microcomputer which have implemented the strengthening of security and the speeding up and enhancement of signal processing for the security. In an IC card, which is supplied with an operating voltage by an electrical connection between each of external terminals and a read/write device, and includes an input-output operation of data with an encoding process or a decoding process, a disturbance-aimed processing operation is included in the encoding process or decoding process to uniformalize timings provided to operate an internal circuit and its operating current. In a microcomputer having a module configuration including an input-output operation of data with an encoding process or a decoding process, a disturbance-aimed processing operation is included in the encoding process or decoding process to uniformalize timings provided to operate an internal circuit and its operating current.

IC card and microprocessor

Growing community of inventors

Kodaira, Japan

Masatoshi Takahashi