Reset Pin functionality

[A.P]

Hi!

I'm trying to understand from the documentation why the reset pin is unique.

What I mean by that is why is the reset pin different than assigning a GPIO to a button and asking for a soft device reset when it is pressed?
Is the voltage cut from the MCU when the reset pin is pressed like when removing the battery? How does the reset pin affect memory retention etc? will the reset pin work if my MCU is stuck for some reason and is unresponsive?

Also, I can't find the thread but I read somewhere that the reset pin has some unique functionality with regards to the DFU process. Could you clarify please?

Thanks!

[Jørgen Holmefjord]

Hi,

The different reset sources are described in the product specifications. You can see which targets are reset by the different reset sources in the table under Reset behavior. As you can see, there are more targets reset by the pin reset.

If the application is stuck, using a GPIO and triggering a soft reset would only work if the application is in an interrupt priority lower than the GPIOTE interrupt level. Pin reset does not have this limitation.

With regards to DFU, PINRESET can be used as one of the methods to enter the bootloader (NRF_BL_DFU_ENTER_METHOD_PINRESET).

Best regards,
Jørgen