Patent ID: 7759196

Claim:
A method of programming a multi-bit non-volatile memory device using a multi-bit non-volatile memory device comprising: a channel region formed in a semiconductor substrate; a source and a drain located at the each ends of the channel region of the semiconductor substrate, and forming a Schottky contact with the channel region; a central gate electrode formed on a portion of the channel region; first and second sidewall gate electrodes formed parallel to the central gate electrode on the channel region and along the outer sides of the central gate electrode; and a first tunneling insulating layer, a first storage node and a first blocking insulating film formed between the channel region and the first sidewall gate electrode and a second tunnel insulating layer, a second storage node and a second blocking insulating film formed between the channel region and the second sidewall gate electrode, wherein a program voltage is selectively supplied to at least one word line after the first and second sidewall gate electrodes are set as first and second word lines and the source and the drain are grounded, thereby storing charge in the storage node corresponding to the selected word line.