nRF52: Time from calling __WFI() to HFINT turn off?

[CurtisHx]

Assuming that all peripherals that require the high frequency clock are disabled / turned off / stopped, how long does the HFINT oscillator run after calling __WFI()?

And if it's greater than 1ms or so, is there any way to shut it off faster?

[CurtisHx]

If HFCLK is already powered down by the time __WFI() is called, then what's the CPU running off of?

[Susheel Nuguru]

Hi, I am not thinking straight today .. sorry for that answer. I had to delete it not to look stupid to others :)

The startup time for internal HF internal CLK is given to be 3us. I am pretty sure it will be stopped faster than 1ms.