what information does the nrfjprog.exe write to UICR register??

[hawk]

what information does the nrfjprog.exe write to UICR(User Information Configuration Registers) register??

==========Tutorial of Flashing dfu bootloader to the nRF51 DK====== we need to make sure that nrfjprog.exe is configured as the tool for flash programming in project options. The default J-link target driver cannot correctly program the bootloader, this is because J-link can not write directly to the User Information Configuration Registers(UICR) from a hex file. The example project is preconfigured to use nrfjprog.exe, which is installed with the nRF51 MDK, and must be in the Windows system path.

[Michael Dietz]

Hey guys,

Just a note: When using nRF52 series devices you do not need to do this. Keil can write and erase the UICR in nRF52 devices using the default J-Link driver no problem. If you are using nRF52 ignore this step in the tutorial and program devices how you normally do, simpler.

This is only the case for nRF51 as it is more complicated here.