| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a data processor allowing selective use of USB (Universal Serial Bus) communication or NFC-WI (Near Field Communication Wired Interface) communication by use of common external terminals. <P>SOLUTION: An IC card has a microcontroller, and the microcontroller selectively usably has a USB control circuit and an NFC-WI control circuit interfaced with a front end circuit for a non-contact interface. A first external terminal and a second external terminal are allocated to the USB control circuit and the NFC-WI control circuit in common, and a changeover circuit changing over initial states of the first external terminal and the second external terminal used in common is mounted in the data processor. The changeover circuit initializes the first external terminal and the second external terminal as differential data terminals for a USB interface when the use of the USB control circuit is instructed, initializes the first external terminal as a signal input terminal and initializes the second external terminal as a signal output terminal when the use of the NFC-WI control circuit is instructed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
