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Can I disable HFOSC ?

Yes, HFOSC can be disabled by clearing bit 1 in OSCCTRL - Oscillator Control Register


*pREG_CLKG0_OSC_KEY = 0xCB14; //unlock



But make sure that HFOSC is not the source to any of the Clock muxes (Root Clock mux, GP Timer mux, PLL mux and the RCLK mux – Flash reference clock)


Disabling HFOSC without changing the source for the above clock muxes will lead to improper functioning of the device.