| 摘要 |
PURPOSE:To facilitate information confirmation such as decision of error and data by providing a nonvolatile memory unit to store data and the number of data there and by abandoning oldest data to update memory contents when the number of data exceeds a prescribed value. CONSTITUTION:A C-MOSRAM backed up always by a battery is used as RAM2, and as control units, system control unit SCU, mechanical element controlling module control unit MCU, and communication controlling unit CCU are provided. Read/write of RAM2 is executed by input of the number of stored data into the memory in the mu-CPU, data shift for every one byte, input of newest data, decision for the number of data under the capacity or over the capacity, increment of the number of data by +1 in case of the number of data under the capacity, no operation in case of the number of data over the capacity, etc. SCU checks errors of MCU and CCU, and MCU and CCU check errors of units controlled by themselves respectively and report them to SCU, and SCU responds to these errors to control error report, write of error No. into RAM2, and power off. |
