使用MSP430F5255单片机，外围电路全部没有焊接，只接了晶振和外部滤波电容。系统使用的是外部晶振12M，所有IO口配置为输出，并且拉低。进入LPM3模式，测得的电流有350uA，和datasheet里面说的25uA差了10倍，请问是什么问题？
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