https://devzone.nordicsemi.com/f/nordic-q-a/76216/4-4-1-2-application-cpu-runningHi, I found I APPCPU3 is 0.3mA higher than I APPCPU5 . I have no idea. How come CPU consumes more power utilizing HFXO64M, an external oscillator 64MHz, than utilizing a basic 32 MHz crystal?en-USTelligent Community 13Thu, 10 Jun 2021 08:28:31 GMThttps://devzone.nordicsemi.com/thread/314624?ContentTypeID=1Thu, 10 Jun 2021 08:28:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:59d1c405-09da-4735-a6fb-71f5ae2f84b4Turbo J<p>Only an external 32 MHz crystal is supported for the high frequency clocks, see the OSCILLATORS chapter in the PS.</p> <p>APPCPU5 runs code on the internal 64MHz oscillator, which consumes less current but is also not nearly as stable as a crystal. Thus the 0.3mA difference for APPCPU3 is just running from crystal vs. running from internal oscillator (HFINT64M).</p><div style="clear:both;"></div>