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MSP430 的RTC的设计真蛋疼

Other Parts Discussed in Thread: MSP430F5509

最近在看msp430资料,需要一款48Pin的芯片。看中了msp430F5509这款, rtc这个居然不能使用单独电池供电,掉电后不保存。需要保存RTC的芯片需选择 带rtc backup功能的,官网看了一下,带这个功能的都是比较高端的芯片啊。都是80-100pin的。真蛋疼。