MEMORY CIRCUIT

摘要

PURPOSE: A memory circuit is provided to maintain a data signal by using a transistor with a channel in an oxide semiconductor layer when power is not supplied. CONSTITUTION: A memory circuit(111) includes a nonvolatile memory unit and a volatile memory unit. The nonvolatile memory unit includes a first transistor and a second transistor and maintains a data signal from the volatile memory unit in a node connected to a gate of a second transistor and one of a source or drain of a first transistor when the volatile memory unit stops. A booster circuit(112) is installed between a gate of a first transistor and a wire to supply power potential and boosts a voltage applied to the gate of the first transistor.