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请教一下，AM3352的VDDS的1.8V必须和VRTC的1.8V是同时上电吗？如果VDDS的1.8V后上电会怎么样？目前板子不打印CCC
VDSS_RTC是先于VDSS上电的，请看数据手册上的上电时序图。
6.1 Power Supplies
http://www.ti.com.cn/cn/lit/ds/symlink/am3352.pdf
