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Pin reset on nRF52820


how can I perform a hardware reset on the nRF52820 via the nRESET pin (P0.18)? Is it enough to activate the macro CONFIG_GPIO_AS_PINRESET? And then pull the nRESET pin of the nRF52 low via an external source?

Unfortunately, this has not worked so far because the pin is permanently high. With an STM32 I pull the RESET pin low, but with the multimeter I still measure high level on the nRF.

Best regards