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MSP430F5336的BACKUP SYSTEM,当使用主电时,备电引脚上的电流达到了22uA,这是为什么?

Other Parts Discussed in Thread: MSP430F5336

正在使用MSP430F5336的BACKUP SYSTEM和RTC_B,一切功能正常,除了使用主电时,备电引脚上的电流( Ibak )过大,达到了22uA左右。我把BAKCTL奇存器中的BAKDIS位置位,关闭BACKUP功能,电流仍然无变化。这是什么原因呢?