| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonvolatile semiconductor device 1 capable of performing optimum write and read controls even for diversified types of data in consideration of the rewrite frequency, required capacity, and data holding period. <P>SOLUTION: A nonvolatile semiconductor device 1, which accesses a data area 5b divided into predetermined areas by using a nonvolatile semiconductor memory 5 having multilevel cells, includes a management area 5a for storing a write setting which makes each of the areas correspond to a write data type. The write setting is made so as to switch between a multi-level cell and a single-level cell, and to change a write level according to the data type; and on the basis of the write setting, write and read are performed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
