Method of erasing a flash memory

摘要

This invention discloses a method of erasing a flash memory, in which the method comprises: (A) erasing all cells of a selected sector; (B) verifying in cells whether the cells are erased; (C) saving an address corresponding to a non-erased cell and re-erasing the cells when the non-erased cell is detected by the step (B); (D) verifying in cells, from the saved address to the final address whether the cells are erased; and (E) executing a slight-program for recovering over-erased cells so that the cells of the sector are normally erased.