| 摘要 |
PURPOSE:To prevent an access to be external part of an area and to attain a security management by dividing a data memory part into plural areas and making one of them a specific address area accessible. CONSTITUTION:On a certain area, data converted to the specific address is previously stored in a program memory 13. At the time of making access a data memory 12, the data is address converted from the program memory 13 to the data memory 12 according to a control program. Accordingly, when a data memory is once set as the specific address, the access is uniformly carried out in the specific address and the area which is not designated as the specific address cannot be made to access. Thereby, at the time of making access the data in the data memory 12, secret data except it is not made to access but the contents thereof can be protected. |
