Electronic device with card interface

摘要

When initializing a card-shaped device (20a) inserted in a card interface (11), operation mode acquiring means (141) incorporated in an electronic device (10) acquires operation mode information, stored in a register file (21) incorporated in the card-shaped device (20a), by a predetermined procedure using a predetermined pin (CMD). Operation mode setting means (141) incorporated in the electronic device (10) executes signal assignment on a plurality of data pins (DATÄ3:0Ü) peculiar to an operation mode indicated by the acquired operation mode information, thereby switching a data transfer width, and allowing the card-shaped device to operate in the operation mode.