| 摘要 |
A data processing apparatus for IC card media. The data processing apparatus has a function for holding one of the portable media and supplying a clock signal to the held medium for the purpose of establishing communication with the portable medium in the synchronous communication protocol, a function for determining whether the held medium uses the synchronous communication protocol or the asynchronous communication protocol in accordance with data transmitted from the held medium in response to the clock signal, a function for continuing a subsequent communication with the held medium in the synchronous communication protocol when a determination has been made that the synchronous communication protocol is used, and a function for supplying a clock signal to the held medium of the purpose of establishing communication with the portable medium in the asynchronous communication protocol when a determination has been made that the asynchronous communication protocol is used.
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