Abstract: The present invention provides a data processing method for a memory and a related data processor for performing the method. A page of data may be divided into multiple groups. In each group, the number of “1”s and the number of “0”s are determined, so as to determine whether to reverse or keep the bit data in the group. The encoding scheme may make the bit value “0” more concentrated on the middle states of the state distribution than the bit value “1”. The data processor thereby reverses the bit data in a group if the number of “1”s is greater than the number of “0”s in the group, and keeps the bit data in a group if the number of “1”s is less than the number of “0”s in the group. As a result, the occurrence probability of the states at two sides becomes lower and the occurrence probability of the middle states becomes higher. This improves data retention of the memory.