| 摘要 |
<p>By outputting at least a clock signal to a memory card (5) that operates on power supplied from the outside and is synchronized on a clock signal inputted from the outside, a primary microcomputer (3) in this data-storage control device (1) controls said memory card (5). If a +B voltage is less than or equal to a momentary-interruption threshold, a momentary-power-supply-interruption detection circuit (8) determines that a momentary interruption has occurred in said +B voltage. If it is determined that a momentary interruption has occurred in the +B voltage, a secondary microcomputer (4) forcibly shuts down the primary microcomputer (3) by cutting the supply of power thereto, thereby stopping the primary microcomputer (3) from outputting the abovementioned clock signal. A backup capacitor (22) continuously supplies power to the memory card (5) until at least a backup period has elapsed since the +B voltage cut out. This makes it possible to avoid corruption of data stored in the memory card.</p> |
