| 摘要 |
<p>PROBLEM TO BE SOLVED: To install an interface for connecting a tool and accessing an internal circuit, at low cost and in a compact size.SOLUTION: A microcomputer 110 detects a card detection signal DETECT and a write protect signal WP which are inputted from an external unit connected to an SD connector 130, and when the microcomputer 110 detects that the signals are values which cannot exist when the SD card 400 is connected, a bus switch 120 is switched so that the signals inputted from the SD connector 130 is connected to a UART bus. The unit, as a tool 500, which outputs the card detection signal DETECT and the write protect signal WP which are the values that cannot exist, is connected to the SD connector 130.</p> |
