MSPM0G3519: some questions about low power mode

Tool/software:

Hi team,

My customer is evaluating M0G3519. They have some question about power consumption. Please help clarify. Thank you. 

 ~~~~~~~~

In the datasheet, it supports 5 types of modes as below.

– RUN: 123μA/MHz (CoreMark)

– SLEEP: 38μA/MHz

– STOP: 223μA at 4MHz

– STANDBY: 1.7μA at 32kHz with RTC and SRAM Bank 0 and state retention

– SHUTDOWN: 92nA with IO wake-up capability 

1. If M0G3519 entered SHUTDOWN mode, does RTC still working to count?
2. If we want to keep RTC working, does it mean that M0G3519 can only enter STANDBY?
3. If we don't have external 32kHz, which mode is deepest low power mode to keep RTC working?
4. Above value of power consumption in the datasheet, are these the latest number?