Keep HFCLOCK asleep on program wakeup

[ishgum]

Just a question out of interest.

Is it possible to prevent the HFCLOCK from waking up on events and execute software on the LFCLOCK. I think this would be really useful to save battery in non time-critical applications.

[MartinBL]

Hi,

So you are asking if it is possible to run the CPU at 32 kilo Hz? Unfortunately it isn't. 

We get question about whether it is possible to slow down the HFCLOCK from time to time too, but that is unfortunately not possible either. Our argument is that if you slow down the HFCLOCK, or use the LFCLOCK, then each process would take more time, during which the system has to stay on and consume current. So in the end there isn't much, if anything to save. 

Best regards
Martin