Portable electronic device having a memory with restricted access in off-line modes
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United States of America Patent
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-
Dec 1, 1992
Grant Date -
N/A
app pub date -
Jun 6, 1990
filing date -
Jun 12, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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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