SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The MOSC supports the use of crystals with a frequency of 5 to 25 MHz. The RSCLKCFG register can be configured to specify the MOSC as the system clock or as the PLL input source. The MOSC can be selected as the oscillator source by programming the OSCRC bit in the RSCLKCFG register. The NOXTAL bit in the MOSCCTL register lets the user turn off power to the MOSC if no crystal is connected, which reduces power draw from the MOSC circuit.