| 摘要 |
<p>An interface unit (13) corresponding to a data pin (DAT1 or DAT0) of an SD memory card comprises a reception buffer (133 or 135) having a lead-through current preventing function. The card interface controller (14) validates the lead-through current preventing function when the SD 1-bit mode or SPI mode in which the data lines (DAT1 and DAT2) are not used is designated by a command from a host controller (111), and invalidates the lead-through current preventing function when the SD 4-bit mode is designated. The safety of the card device is enhanced, and wasteful power consumption is saved. <IMAGE></p> |
