| 摘要 |
<p>An IC card which enables external display of the response state in data communication which is carried out in response to data received from outside. An IC card (100) has a data protection memory (3) for a data holding memory (2). An anomaly discrimination circuit (1) discriminates the processing state of data of the data holding memory (2). If the anomaly discrimination circuit (1) judges that the data received from outside have been normally written into the data holding memory (2), a response state display unit (7) carries out normal communication completion display, directed by a main control circuit (11). On the other hand, if it is judged that there is anomally in the data write state, and if the data of the data holding memory (2) could be restored by data of the data protection memory (3), the response state display unit (7) carries out data restoration display. If the data could not be restored, communication anomaly display is carried out.</p> |
