peek/poke or other method to write direct into nrf52 registers?

Following this topic (https://devzone.nordicsemi.com/question/67300/writing-to-uicr-from-application-code/) it seems that the flash needs to be Write Enabled by writing 0x01 into CONFIG reg at addr 0x4001E504.
I use poke32for that, like following:

var NVMCCONFIGreg=0x4001E504;
poke32(NVMCCONFIGreg,0x00000001);

This instruction has the effect of disconnecting the Puck.js from the IDE (reset?)
Does anyone ever used poke32 on a NRF52?