| 摘要 |
PURPOSE:To clarify operating conditions before and after generating a trouble and analyze the trouble highly accurately and easily, by a method wherein memorized data are transferred to a non-volatile memory cell to store them upon generating the trouble. CONSTITUTION:A RAM 8 rewrites the data of a data cell into updated data one after another and stores the data of (n) times immediately before the rewriting. When a trouble is generated, the RAM 8 effects the sampling of the data of (n-m) times (0<=m<=n) after generating the trouble. When the data before and after generating the trouble are recorded, the sampling is stopped and the data are transferred to a non-volatile memory cell 9. As a result, (m) pieces of data before generating the trouble and (n-m) pieces of data after generating the trouble are stored in the non-volatile memory cell 9. |
