Semiconductor memory device having a volatile memory device and a non-volatile memory device

Claim 1

In a semiconductor memory device comprising: a volatile memory means; a non-volatile memory means; a mode switch means for selecting either mode of a volatile memory mode in which said memory device functions as a volatile memory device and a non-volatile memory mode in which said memory device functions as a non-volatile memory device; and a transfer means for transferring data between said volatile memory means and said non-volatile memory means in accordance with the mode selected by said switch means, the improvement existing in that said volatile memory means consists of one transistor and one capacitor, and one of the terminals of said capacitor is electrically isolated from said non-volatile memory means and electrically coupled to a terminal to which one of a plurality of predetermined voltages is applied and said non-volatile memory means comprises a first MOS transistor having a floating gate and a control gate, and said mode switch means comprises a second MOS transistor, said control gate of said first MOS transistor and the control gate of said second MOS transistor being formed integrally.