MSPM0L1228: How to config LFXT(PA3, PA4), HFXT (PA5, PA6) on mspm0l-1228

Hi,

As mentioned in the title, I can’t see the configuration for HFXT in syscfg.SYSCTL (SysConfig v1.25.0), as shown in the TI example below. 

\mspm0_sdk_2_08_00_04\examples\nortos\LP_MSPM0L2228\driverlib\sysctl_hfxt_run\sysctl_hfxt_run.syscfg

const pinFunction4                        = system.clockTree["HFXT"];
pinFunction4.enable                       = true;
pinFunction4.HFCLKMonitor                 = true;
pinFunction4.HFXTStartup                  = 10;
pinFunction4.inputFreq                    = 40;
pinFunction4.peripheral.hfxInPin.$assign  = "PA5";
pinFunction4.peripheral.hfxOutPin.$assign = "PA6"

My questions:

1) Could you show me how to configure LFXT and HFXT?

2) Above example, although HFXT is used and shown in the clock tree, the MCLK source in syscfg.SYSCTL.MCLK (Main Clock) is still set to SYSOSC. Is there any issue with this?

3) For LFXT on the MSPM0L1228, is an internal crystal oscillator provided, or must an external clock source be driven into the LFXIN/LFXOUT pins?

4) If I use an external LFXT clock, does it affect the fast-wake functionality of GPIO and UART (for example, when the UART RX pin is low) while the MCU is in STANDBY-1 mode?