Microcomputer for IC card

Details Microcomputer for IC card Microcomputer for IC card

1994-02-08

1996-04-09

Hajec, Donald T.

Registers

Records

Conductive

235487, 902 1, 902 26, 364938, 3649384, G06K 1906

Patent

active

055063969

ABSTRACT:
A microcomputer for an IC card arranged so that only a user mode can be performed after the microcomputer has been shipped to a user. Data representing that the microcomputer has been shipped is written at the time of shipment in a test region of an EEPROM. A shipment confirmation routine for confirming whether the shipment data has been written is performed before execution of a branch routine for branching to other programs in accordance with an executed command supplied from outside the microcomputer. If the shipment data has been written in the test region of the EEPROM as confirmed in the shipment confirmation routine, only branching to the user mode is permitted.

REFERENCES:
patent: 4650975 (1987-03-01), Kitchener
patent: 4777355 (1988-10-01), Takahira
patent: 4816656 (1989-03-01), Nakano et al.
patent: 5016212 (1991-05-01), Yamaguchi et al.
patent: 5019970 (1991-05-01), Yamaguchi et al.
patent: 5039850 (1991-08-01), Yamaguchi
patent: 5062075 (1991-10-01), Yoshida et al.
patent: 5126541 (1992-06-01), Shinagawa
patent: 5206938 (1993-04-01), Fujioka
patent: 5286962 (1994-02-01), Fujioka et al.
patent: 5293610 (1994-03-01), Schwarz
Volker Timm, Elektronik, vol. 37, No. 22, 28, Oct. 1988, Munchen de, pp. 204-208.

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