| 摘要 |
A host device (2) reads out information from a card (1) and writes information in the card. The host device can supply a power supply voltage which belongs to either a first voltage range or a second voltage range smaller than the first voltage range, and issues a voltage discriminating command (CMDV) to the card. The voltage discriminating command includes a voltage range discriminating section (VOLS), an error detecting section (ED) and a check pattern section (CPS). The voltage range discriminating section includes information indicating to which of the ranges, namely, the first voltage range or the second voltage range, the power supply voltage belongs. The error detecting section has a pattern configured to permit the card which received the voltage discriminating command to detect an error of the voltage discriminating command. The check pattern section has a pattern previously set. |
