| 摘要 |
PROBLEM TO BE SOLVED: To easily change the size of a read/protect memory, and to design a memory according to the kinds of device, in a short time. SOLUTION: Since a read/protect memory region 4 is formed in the same memory mat as a main memory region 2, an EEPROM cell being exclusive for storing read/protect data and analog control circuit for writing read/protect data in this EEPROM cell are not required exclusively and, therefore chip size can be reduced. |
