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MSP430单片机电池供电的问题

Other Parts Discussed in Thread: MSP430F2122, MSP430F147

我做过一个单片机用电池供电的产品,在产品有外部电源供电的情况下用外部电源,否则用电池供电,但在这两个电源切换的时候单片机的供电电压会在3.0V到2.5V之间有一个摆动,在我不加任何外围电路的情况下,MSP430F147可以正常工作,MSP430F2122在电压有波动的情况下每次都会复位,困惑。。。。