Registers – Records – Conductive
Patent
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.
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Volker Timm, Elektronik, vol. 37, No. 22, 28, Oct. 1988, Munchen de, pp. 204-208.
Filipek Jeffrey R.
Hajec Donald T.
Mitsubishi Denki & Kabushiki Kaisha
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