The REF USING INTEGER clause specifies that the INTEGER data type will be used to represent the REFERENCE type of this structured type and all of its subtypes.
REF USINGINTEGER子句指定了 INTEGER数据类型，将使用这个数据类型表示该结构化类型及其所有子类型的 REFERENCE 类型。
The reference voltage, ref, is applied externally and can be set up to the supply voltage.
基准电压(REF)由外部提供，最高可以设置为电源电压。
The reference voltage, ref, is applied externally and can be set up to the supply voltage.
基准电压(REF)由外部提供，最高可以设置为电源电压。
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