| 摘要 |
PURPOSE:To realize a system that can prevent the reading or writing action of a relevant address area by providing a specific control bit that can discriminate a reading/writing enable area for each address of a local storage. CONSTITUTION:A control bit delivered to a data register 24 is turned on in case an address received an access does not exist in a reading/writing enable area, i.e., an access is given to either one of areas Di+1-DN that can be read and written only by the hardware HW. Then an interruption control circuit 26 is actuated by the output of an AND circuit 25. An interruption is applied to a main processor MP to inhibit the writing or reading action to the data store area of a local storage 21. At the same time, a control program error is informed. Thus a wrong instruction is detected out of a control program and this error is informed to take a measure immediately. In such a way, previously the generation of a fault is prevented. |
