pub type W = W<VREF_SPEC>;
Register VREF writer
VREF
struct W { /* private fields */ }
Bit 1 - Temperature Sensor Output Enable
Bit 2 - Voltage Reference Output Enable
Bit 3 - Temperature Sensor Selection
Bit 6 - Run during Standby
Bit 7 - On Demand Contrl
Bits 16:19 - Voltage Reference Selection
Writes raw bits to the register.
Passing incorrect value can cause undefined behaviour. See reference manual