I need to measure voltage VREFSL with ADC but in the reference manual are not described this option. Is there just VREFSH = internal channel, for ADC self-test, hard connected to VRH internally (ref. manual page number 508). So is possible use as input to the ADC reference voltage VREFSL (internally)? In capture 14.3.2 is written that The ADC can be configured to use reference pairs as the reference voltages used for conversions (VREFSH and VREFSL). Can I set ADC channel with VREFSL voltage?