| 摘要 |
<p>PURPOSE:To stabilize write and erase operations of information, by detecting a variation of voltage applied to a gate electrode, and setting each write and erase time against each varied applied voltage. CONSTITUTION:In case of writing and erasing information to a storage device 3, each write and erase time is varied by the quantity corresponding to the quantity of a variation of supply voltage, by detecting the voltage of an electric power supply 1 by a supply voltage detecting circuit 4, and applying a difference against reference voltage, to a storage device driving circuit 2, and as a result, the storage device 3 is driven so that threshold voltage in a write state and an erase state of the storage device is always constant irrespective of a variation of write voltage and erase voltage.</p> |
