| 摘要 |
PURPOSE: A method for backing up system setting data is provided to achieve a stability of a system when an MCU(Main Control Unit) is reset by backing up setting data, thereby using the setting data used in an existing system. CONSTITUTION: An operator checks whether setting data are changed by a provision on condition that a system is operated by basic setting data(300). If the setting data are changed, changed data are stored in an NVRAM(Non-Volatile Random Access Memory) of an MCU and an SRAM(Static RAM) of two TGU, respectively(302). If the MCU is reset by a dismount and a mount(304), setting data are selected out of the NVRAM and the SRAM, and the system is setup(306). For example, if test data of the SRAM and the NVRAM are different and a checksum of the SRAM is normal, a system setup is performed using setting data of the SRAM. If a system initialization is necessary as a power source of the system is turned-off and turned-on again(308), the system is initialized and the stage is returned to the first stage(310).
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