| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent data stored in a storage device from being lost even when the voltage value of a primary battery falls in a system in which the primary battery performs backup of data of the storage device. SOLUTION: A storage device 3 holds data with a voltage which is supplied from a system when the power source of the system is ON. When the power source of the system is OFF, data is held by the voltage of a primary battery 1. When the voltage of the primary battery 1 drops and it falls below a threshold at the time of power OFF of the system, a voltage abnormality detecting circuit 5 gives a power ON instruction to the power source of the system. By turning ON the power source of the system, the device 3 holds data with a power source from the system and prevents data loss.</p> |
