NRF52 pin RESET

[oliverhu]

hi dear officers since the datasheet states that value 1 stand for connected, does it mean this pin is active-low. in order to physically reset the device, could i connect on active-low button with P0.21. should i connect a pull up resister before the switch. the schematic is like that

[Siddarth]

But what is the default state for reset pin? The registers PSELRESET are set to 0xffff_ffff at reset so GPIO P0.21 is not registered as reset pin by default.

So how can the hardware reset be guaranteed? How should I design the circuit if I want to reset it no matter what the state of the software of flash is?

[Vincent]

Hi, May I ask the enable reset pin web site link again because these link are gone now. Thanks

[energy]

Hi,

Do you recommend anything on the reset pin if there is no switch ? I have only a wire that go to a testpad ? Is the internal pull-up enough ? Is there any need for an external pull-up ?

On my product it will be powered directly by a CR2032 or CR123A battery in internal LDO mode

Thanks

[Wojtek]

If you dont want to use reset, just leave this pin floating - as long as you don't explicitly enable reset pin, it won't work. If you want to use it, don't leave it floating - use external pull-up.