| 摘要 |
PURPOSE:To suppress the reduction of processing efficiency at its minimum and to protect reading by detecting whether reading protection is set up in a memory area or not at the return of the memory area, and only when the protection is up, erasing the area. CONSTITUTION:The name 111 of a user, a memory protection mode flag 112, the address or size 113 of a memory area, etc., are registered in a control table 10 for assigning the memory area in a main memory device 1 at every assignment of each user in the area. An area return processing part 21 in a control program 20 formed in the device 1 is provided with a means for detecting whether the reading protection is set up in the memory area or not at the return of the memory area and a means for erasing the area only when the reading protection is set up. Thus, the reduction of the processing efficiency is suppressed at its minimum and the reading protection can erase a necessary area accurately. |
