IC card reader/writer
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United States of America Patent
Stats
-
Aug 25, 1998
Grant Date -
N/A
app pub date -
Feb 20, 1996
filing date -
Feb 20, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A protocol is previously set by a command transmitted from a host device to a reader/writer. When an operation clock supplied from the reader/writer is changed for an IC card to which a plurality of operation clocks can be applied, the host device determines the operation clock based on initial information transmitted from the IC card inserted into the reader/writer, and if it is determined that the operation clock must be changed, it changes the operation clock. If the IC card has a plurality of operation modes, the reader/writer supplies a reset signal to the IC card twice when the reader/writer selects the operation mode of the IC card, and the contents of initial information items obtained at this time are determined t be different form each other after they are compared, the reader/ writer is set into one of the operation modes.
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