> > 3) That's if you're using a microsecond timer, you mean? I figured that > wasn't very useful, since either you lose all synchronization as soon as you > sleep, or you're forced to keep the clock running. Of course, some > applications might not care about the extra power that requires, if they > need the extra accuracy. >
Not necessarily. You can use your 32kHz clock during sleep, and turn on the microsecond clock only when needed. See Janos' implementation for the msp430 in Msp430HybridAlarmCounter or my paper on Virtual High-Resolution Time at this year's IPSN. Cheers, Thomas
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