产品已设计好，小批量生产时出现RTC关机后停在关机的时刻或者走两个小时停住的情况。
硬件上VCC. AUXVCC1.AUXVCC2都连到主电源，AUXVCC3接到纽扣电池，现在的操作是切断主电源前，关掉VCC1，VCC2。过一天设备再开机启动
就出现上面的现象，很难重现，但是试验一批总会有，把出现问题的再拿去试验又无法重现。
请教，切断主电源前还需要设置什么吗？
The secondary supply VBAT powers the backup-supplied subsystem
• at power on
• if bit BAKDIS = 0 in the BAKCTL register and
– if the primary supply drops below the configured high-side SVS level
– if the high-side SVS (SVSH) is disabled
– during LPMx.5
– if bit BAKSW=1 in the BAKCTL register
The primary supply DVCC powers the backup-supplied subsystem
• if the primary supply rises above the power-on level of the high-side SVS level
• if the primary supply remains above the configured high-side SVS level
• if bit BAKDIS = 1 in the BAKCTL register
If the backup-supplied subsystem is powered by the secondary supply VBAT, the access and control to
modules located in the subsystem is restricted:
• The data stored in the backup RAM is retained but cannot be accessed.
• The RTC, if enabled, together with the 32-kHz crystal oscillator continue to operate but the time and
date information cannot be accessed.
• Changes to the LF crystal oscillator setting in the clock system do not take effect.
If the backup-supplied subsystem is powered by the primary supply DVCC and LOCKBAK = 0, the
modules located in the subsystem can be access and controlled normally.
该手册第125,126有介绍使用备份电池的寄存器操作方式。
先确认是否设置的正确
