Method for operating non-volatile memory controller

The method of operating a non-volatile memory controller is provided. Method of operating a non-volatile memory controller divides the data supplied from the host to the first unit of data and a second unit of data, the first code comprising the first of the units of data of n bits (where, n is an integer of 1 or more) the word encoded in (codeword), and the second unit data, nw bits (where, w is a small integer of 1 or more than n) of the first value of the n bit of the code word is corresponding to a zero bit using a second code word bitmap encoding and predetermined by including the first codeword and the second bit for the code word-state map (bit-to-state mapping) performed, and the first code the It involves the respective program word and the second code word in a first page and second page of the non-volatile memory.