| 摘要 |
The present invention provides a memory element which keeps a stored logic state even without supply of power. Also, the present invention easily realizes the stop of power supply to the memory element for a short time, and reduces power consumption. Data (potential) held in a node in a logic circuit can be swiftly saved on a node where one of a source and a drain of the transistor and one electrode of a capacitor included in a memory circuit are connected by lowering a potential of the other electrode of the capacitor before the transistor is turned on. In addition, by making a potential of the other electrode of the capacitor, when the transistor is in an off state, higher than a potential of the other electrode of the capacitor when the transistor is in an on state, a potential of the node to which one electrode of the capacitor is connected can be reliably held even without supply of power. |
