specifies the Option Bytes BOR Reset Level. This parameter can be one of the following values: @arg OB_BOR_LEVEL3: Supply voltage ranges from 2.7 to 3.6 V @arg OB_BOR_LEVEL2: Supply voltage ranges from 2.4 to 2.7 V @arg OB_BOR_LEVEL1: Supply voltage ranges from 2.1 to 2.4 V @arg OB_BOR_OFF: Supply voltage ranges from 1.62 to 2.1 V