Method for checking a reloadable memory, memory checking device, and automatic data restoring device

A device for checking an abnormality of a memory operable to store operative data with which a specified operation is executed in accordance therewith, the device comprising:

• check data generator means for generating check data for checking an abnormality of the memory;
• writing means for writing the check data in a specified portion of the memory and the operative data in another portion of the memory so that the memory stores both the check data and the operative data;
• reading means for reading the check data written in the memory during the time which the specified operation is executed in accordance with the operative data;
• judge means for judging whether a read check data agrees with the generated check data generated by the check data generator means;
• and
• the reading means including timer means for measuring a predetermined time after the reloading of operative data and writing of the check data and the reading means further including means for executing the reading of data from the specified portion of the memory after the lapse of the predetermined time.