Flash memory

A method of error correction of a memory comprising:

• writing the predetermined n bits information data and check data in a memory sector, the memory sector having a plurality of memory cells;
• reading the n bits information data and the check data from the memory sector;
• and
• generating the check data from the n bits information data and performing an error correction of the n bits information data by the n bits information data and the check data, wherein
• when the information data input from an external device is m bits (m<n), the error correction adds predetermined (n−m) bits dummy data to the information data, and generates the check data.

A method of error correction of a memory comprising:

• writing first information data and first check data in each of a plurality of memory cells of a memory sector per one bit in a multi-level write, thereafter, further writing one bit in each of the plurality of memory cells of the memory sector based on the written first information data, the written first check data, second information data and second check data, and writing two-bits data in one memory cell;
• reading the first information data and the first check data from the memory sector in a multi-level read, and reading the second information data and the second check data from the memory sector;
• generating the first check data from the first information data;
• generating the second check data from the second information data;
• correcting an error in the first information data from the first information data and the first check data;
• and
• correcting an error in the second information data from the second information data and the second check data.

A method of error correction of a memory comprising:

• erasing a memory sector having a plurality of memory cells so that data of all memory cells in the memory sector are set to “1”, the memory sector includes information data and check data;
• reading the information data and the check data from the memory sector as are erased;
• and
• correcting an error of the information data by the information data and the check data.