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is there an OTP memory in nRF 52

Samer Mattar

I need to save a serial number that is one time configurable. Is there an OTP memory where I can save that number?

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    Sort of: there is UICR region which can be rewritten (erased) only by erasing whole flash memory content. But if you look for true "only once in the life-time" or "cannot be written more than once" (because UICR can be written several times and if you don't erase it in between it will simply hold the superposition of these two writes) then you are out of luck. Btw. each nRF5x chip has already 8-byte random serial number burned into FICR so you might be redeveloping the wheel;)

    In every case read more about UICR and FICR registers in product specification on Infocenter.

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  • 0

    Sort of: there is UICR region which can be rewritten (erased) only by erasing whole flash memory content. But if you look for true "only once in the life-time" or "cannot be written more than once" (because UICR can be written several times and if you don't erase it in between it will simply hold the superposition of these two writes) then you are out of luck. Btw. each nRF5x chip has already 8-byte random serial number burned into FICR so you might be redeveloping the wheel;)

    In every case read more about UICR and FICR registers in product specification on Infocenter.

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