| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a power control circuit of an external storage device which can turn off the electric power after securely writing data to an external storage unit. SOLUTION: This circuit is equipped with an external storage unit 10 which stores data, a 1st interface which is connected to the external storage unit 10, a 2nd interface for connection with external equipment, a device which performs conversion between the data formats of the 1st and 2nd interfaces, a controller 28 which controls the operation of the whole circuit, an internal switch 35 for supplying the electric power to the external storage unit 10, and an external switch 22 for supplying a power-ON signal; and the controller 28 issues, when it is turned ON, some command to the 1st interface once detecting the external switch 22 being turned on and releases the internal switch 35 when a specific response is sent back from the external storage unit 10, thereby turning off the power source.</p> |
