MSP430F6747: Questions for RTC_C

Part Number:MSP430F6747

Hi,

I got questions from customer about RTC_C module in MSP430F6747.

Q1) What is operating voltage range?
I understood RTC_C uses dedicated AUXVCC3 supply, but datasheet does not seem to provide Recommended Operating Conditions for AUXVCC3.
Is this the same as Vcc?

Q2) Is this possible to detect RTC_C stops working in any way?

hanks and regards,
Koichiro Tashiro