Patent ID: 7449747

Claim:
A semiconductor device comprising: first to third regions in a semiconductor substrate, the second region being located between the first and third regions; a first charge storage region formed on the second region through an insulator, a distance between the first charge storage region and the first region being shorter than a distance between the first charge storage region and the third region; a second charge storage region formed on the second region through an insulator, a distance between the second charge storage region and the third region being shorter than a distance between the second charge storage region and the first region; a first electrode formed on the second region through an insulator and located between the first and second charge storage regions; and a second electrode formed over the first charge storage region, the second charge storage region, and the first electrode, wherein the second electrode extends in a first direction from the first region to the third region, the first electrode extends in a second direction crossing the first direction, and the first electrode and second electrode are arranged such that, in a write operation to the first charge storage region, electrons flow from the third region to the first region through the second region, hot electrons injected into the first charge storage region are generated in the second region, and the first electrode is supplied with a smaller voltage than a voltage supplied to the second electrode.