SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The clock source that is configured as the HIB clock has the option of becoming an internal output, RTCOSC, and being selected as the clock source for the system clock. To enable RTCOSC as a system clock source, the SYSCLKEN bit must be set in the Hibernate Clock Control (HIBCC) register.