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nrf51822 ANAEN

Referring to page 58 of the reference manual there is a ANAEN control signal that will contect a gpio pin to a corresponding analog input

I am using GPIO P0.01 -> AIN2 Eval board

What mechanism is used to control ANAEN? Do we need to explicitly write this value in a GPIO config register. This is not very well sited in the documentation ANAEN appears no where else in the document.

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