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Query regarding the clock source

Hi ,

I am working on the project based on nrf9160.

Please verify it-

1. I want to print the current clock source of the board as board is initially work on LFCLK. I printed the clock source based on the status of the LFCLKSRC register.

2. I changed the clock from lower to higher clock source but register values are not updated .

as i changed the values of register NRF_CLOCK->TASKS_HFCLKSTART = 1; (trigger it) it should go to 64MHz 

could you please tell me where i am doing the mistake

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