在使用外部存储器之前，必须看看它是否可用，是否可写。
Before using the external storage, you must see if it is available, and if it is writable.
控制过程中所需的一些配置信息可通过SPI接口从外部FLASH存储器读取，所需记录的数据也可写入该存储器中。
It is available reading some configuration information required by control process from external FLASH memory through SPI interface and writing data records in the memory.
控制过程中所需的一些配置信息可通过SPI接口从外部FLASH存储器读取，所需记录的数据也可写入该存储器中。
It is available reading some configuration information required by control process from external FLASH memory through SPI interface and writing data records in the memory.
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