Portable electronic device having a memory with restricted acces

Details Portable electronic device having a memory with restricted acces Portable electronic device having a memory with restricted acces

1990-06-06

1992-12-01

Weinhardt, Robert

Registers

Records

Conductive

235380, 235382, G06F 1521

Patent

active

051681510

ABSTRACT:
An IC card having a CPU and a memory is used in on-line and off-line modes. The memory has a nonrewritable first memory area for storing a basic function, and a rewritable second memory area capable of storing a user application program. The IC card includes a circuit for switching between enabling and disabling accesses to the second memory area in response to the mode of the on-line and off-line.

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patent: 4572946 (1986-02-01), Schrenk
patent: 4754418 (1988-06-01), Hara
patent: 4767920 (1988-08-01), Kitta
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patent: 4804825 (1989-02-01), Bitoh
patent: 4816653 (1989-03-01), Anderl
patent: 4816654 (1989-03-01), Anderl
patent: 4827111 (1989-05-01), Kondo
patent: 4827512 (1989-05-01), Hirokawa
patent: 4887234 (1989-01-01), Iijima
patent: 4920256 (1990-04-01), Marty
patent: 4973828 (1990-11-01), Naruse
patent: 4983816 (1991-01-01), Iijima

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