MSP432P401M: DCO Init with External Resitor

Part Number:MSP432P401M

Hello,

we're just before getting our first samples with MSP432P401M using the internal DCO. This is a Bluetooth application providing SPP with the CC2654MODA module. On the current launchpad it is used without external resisitor, but for stability reasons we plan to use an external resistor on the target. The implementation runs with 48MHz.

Two questions regarding initializing DCO with external resistor:

1. The reference sheet (slau356; 5.2.8.1) mentions that the DCORSEL have to be 1, which means 3MHz, when activating the external resitor. Is it possible to change the DCO frequency simply to 48MHz (DCORSEL=5) afterwards?
2. Is it required to set the calibration data CSDCOERCALx, when matching the nominal frequency?

Is it in generell required to have an external resistor to match an UART baud rate (115k)?

Thanks, Matthias