SLASE46A February 2015 – October 2018 MSP430F6720A , MSP430F6721A , MSP430F6723A , MSP430F6724A , MSP430F6725A , MSP430F6726A , MSP430F6730A , MSP430F6731A , MSP430F6733A , MSP430F6734A , MSP430F6735A , MSP430F6736A
The Backup subsystem operates on a dedicated power supply AUXVCC3. This subsystem includes low-frequency oscillator (XT1), RTC module, and backup RAM. The functionality of the Backup subsystem is retained during LPM3.5. The Backup subsystem module registers cannot be accessed by CPU when the high-side SVS is disabled by the user. It is necessary to keep the high-side SVS enabled with SVSHMD = 1 and SVSMHACE = 0 to turn off the low-frequency oscillator (XT1) in LPM4.