9 internal +1.2v regulator disable, 1 disable the internal +1.2v regulator, 2 enable the internal +1.2v regulator – SMSC FlexPWR LAN8710i User Manual
Page 31: Internal +1.2v regulator disable 4.9.1, Disable the internal +1.2v regulator, Enable the internal +1.2v regulator, Section 4.9, Datasheet

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