Can the NRFFW / NRFHW registers be used for customer config on a custom PCB with custom FW?

[CurtisHx]

In table 32 on page 25 of the NRF51 Reference Manual, there are a bunch of registers with the description "Reserved for Nordic firmware design" or "Reserved or Nordic hardware design".

Can those registers be used for customer configuration if a NRF51 series chip is being used on a custom PCB with custom firmware running on it? Or are those trim values that need to get loaded into other registers in other modules on startup?

[Hung Bui]

Hi Curtis,

Those registers can be used but it's not recommended. We may use some of them in our SDk/Softdevice in the future.

If the customer want to store large amount of data, they can use a normal flash page for the purpose. The only difference between a normal flash page and the UICR is that the UICR can't be rewritten without a full erase of the chip.