Title:
PORTABLE DATA CARRIER
Document Type and Number:
Japanese Patent JP2547379
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a portable data carrier which is provided with a burglarproof means and used for storing and processing data.
SOLUTION: A data carrier is provided with a microprocessor, a nonvolatile memory composed of a programmable read-only memory, and an access memory and error memory composed of electrically rewritable read-only memory type memory elements and the microprocessor is provided with a means which, when access is tried, reads out the access and error codes of the contents of the access and error memories, stores the codes in the registers A and B, respectively, of the microprocessor, and checks an enabling key. When the enabling key is proper, the means erases the content of the access memory and, at the same time, rewrites the content of the register A in the access memory as an access code after increasing the content of the register A by one unit. When the enabling key is improper, the means erases the content of the error memory and, at the same time, rewrites the content of the register B in the error memory as an error code after increasing the content of the register B by one unit.
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Inventors:
UGON MICHERU
Application Number:
JP23879195A
Publication Date:
October 23, 1996
Filing Date:
September 18, 1995
Export Citation:
Assignee:
BULL SA
International Classes:
B42D15/10; G06F1/00; G06F12/14; G06F21/62; G06K17/00; G06K19/073; G06Q40/00; G07F7/10; G11C16/22; (IPC1-7): G06K19/073; G06F12/14; G06F19/00; G06K17/00
Domestic Patent References:
| JP5446447A | ||||
| JP53121435A |
Other References:
【文献】日経エレクトロニクス156号、第80乃至92頁(昭和52年3月21日発行)
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)