Change the 16MHZ crystal oscillator into an external clock source whose rate between 1MHZ and 5MHZ.

[lohlpp]

May I ask you a question? concerning I disable the radio of nRF51822 2.4GHZ ， don't run the Ble，don't apply the the RC Oscillator of the 16MHZ and only use GPIO，could the chip work normally if I change the 16MHZ crystal oscillator into an external clock source whose rate between 1MHZ and 5MHZ.

[ovrebekk]

Hi

Just to clarify, do you want to remove the 16MHz crystal, and run the nRF51822 from an external 1-5MHz clock source, or are you trying to generate a 1-5MHz clock from the nRF51822?

[lohlpp]

Hi, receiver,thank you for your reply. I means to remove the 16MHz crystal, and run the nRF51822 from an external 1-5MHz clock source. will it work?

[ovrebekk]

Hi

The nRF51822 has only been tested to run from a 16 or 32 MHz source, and if you use anything else then we don't know what the consequences will be, so I would strongly advice against it.

If you don't need the radio then you can always use the internal 16MHz RC oscillator as the clock source, without needing any external clock. Because of the quick wake from sleep time of the nRF51822 it is more efficient in terms of average current to do all the CPU processing quickly at 16MHz, and then go to sleep, rather than lowering the CPU clock.

Best regards
Torbjørn

[lohlpp]

Thanks. I know what you mean. Best regards.

[ovrebekk]

I am happy to help. The best of luck with your project :)