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裸板单片机功耗下不来

Other Parts Discussed in Thread: MSP430F2232

做了一个小的手持设备,测试的功耗总是高,于是我一个一个的拆件,拆到最后的情况如下:

板子只有一个单片机(型号为MSP430F2232),一个32768晶振,一个复位电阻47K,一个复位电容104。电源过来后串接一个10欧姆电阻。

程序如下:

WDTCTL = WDTPW|WDTHOLD; //关闭看门狗
// LPM3;
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3 w/ interrupt

最后测得10欧电阻上电压为0.5mV,则单片机电流为50uA

这个功耗不能称之为低功耗吧,我哪里出问题了呢