I have a system that has to be in a low power sleep mode that needs to wakeup every hour, take a temperature measurement, then go back to sleep. There are other modes that run full speed but I am not worried about them at this time.
Is there a document that talks about the low power modes in more detail than the Family Manual slau208p? A search of "MSP430 Low Power Modes" generated 0 documents. a search of "MSP430 Low Power" generated over 3400 articles. Mostly datasheets. I do not know what to search for.
I think I cannot use LPM4 because that stops all the oscillators including the watchdog timer, so I do not have a way to measure roughly 1 hour to wake up. I guess the only way to wake up from LPM4 is an external signal.
So that leaves me with LPM3.
On another processors I read a study that determined it was better to run at a faster clock rate so the time you were active was shorter and the overall power was less than running at a slower clock rate longer. (Operation was the same number of cycles.) Is there a study or information on that with the MSP430?
I am guessing right now, if I turn off the external 32.768 kHz crystal and switch to the VLO that is the best. Should I use the Watchdog timer or one of the other timers for my 1 hour wakeup? I am not sure of the trade-offs. That was what I was trying to find a document about.