| 摘要 |
PROBLEM TO BE SOLVED: To provide a data processor with a configuration by which written matters information of a regular sentence data which is preserved in a memory and secrecy information are nearly perfectly prevented from being leaked or illegally rewritten. SOLUTION: The data processor is shared by more than one circuits or devices, which comprise a programmable circuit, and is provided with the memory where a preservation area where access by the programmable circuit is limited is arranged in a part of a storage area as the preservation area of information to be non-ciphered sentence data. When the programmable circuit performs access to the non-opened area of the memory, access is regarded as the illegal one so that an illegal access preventing operation is performed. |
