msp430G2系列，指导手册中有这样一段：
The MSP430 devices have several low-power modes. Different clock signals are available in different
low-power modes. The requirements of the user’s application and the type of clocking used determine
how the WDT+ should be configured. For example, the WDT+ should not be configured in watchdog mode
with SMCLK as its clock source if the user wants to use low-power mode 3 because the WDT+ will keep
SMCLK enabled for its clock source, increasing the current consumption of LPM3. When the watchdog
timer+ is not required, the WDTHOLD bit can be used to hold the WDTCNT, reducing power consumption.
但是在哪里查到底多少功耗呀？
