Patent ID: 8649208

Claim:
A method for driving a semiconductor device, the semiconductor device comprising a memory cell: wherein in the memory cell, a source electrode of a first transistor is electrically connected to a bit line, a drain electrode of the first transistor is electrically connected to a source line, and a gate electrode of the first transistor, a drain electrode of a second transistor, and one electrode of a capacitor are electrically connected to each other to form a node where a potential is held, the method comprising the steps of, in a data reading period: supplying a ground potential to the source line; connecting the bit line to a precharge potential supplying line so that the bit line is set to a precharge potential; disconnecting the bit line from the precharge potential supplying line so that a potential of the bit line changes depending on a potential held in the node; and reading a change in potential of the bit line to read the potential held in the node.