Provided are a flash memory device and a method of driving the same for reading set information and stably storing the read set information in a latch. The method of driving the flash memory device includes applying power to the flash memory device, which includes a memory cell array for storing set information used to set an operating environment of the flash memory device. An initial read operation of the memory cell array is performed to read the set information. The set information read in the initial read operation is stored in a latch. It is determined whether the set information is normally stored in the latch based on set data input to the latch and set data output from the latch.