nRF52 (n52832) downgrading?

[jakbar]

Hi everyone, I was wondering if it is possible to change clock frequency on n52832 manually. Datasheet (from n52832) says that it is automated distributed but do you know about "downgrading" clock to obtain maximalize power saving when you do not need "full power" of your CPU? Or it is not possible because "automated distributed" solution is max power saving as its possible?

[endnode]

No, all nRF5x chips have fixed clock architecture for MCU as well as all HW peripheral blocks. The only way how to save power is to manage each HW peripheral separately (= disable them when not used) and by using POWER ON SLEEP (wait for event) whenever possible (or go to POWER OFF if your application architecture allows it).

If your HF clock source (external 32MHz crystal) will get out of spec then nRF5x chip can behave unpredictably (typically hardfault).

[Nguyen Hoan Hoang]

You cannot change CPU frequency but you can however disable the HF and use LF clock source to save power.