RE: nrf52 enables protection by accident?

Priyanka — Mon, 12 May 2025 11:13:23 GMT

Hi Anthony,

Yes, this is a known behavior. If your application is somehow writing to UICR->APPROTECT (e.g., setting it to 0x00), or if you have ENABLE_APPROTECT defined in your project, the device will enable protection after a reset.

[quote user=""]Am I somehow crashing and slamming the bits?[/quote]

This might not be the issue as it's quite a rare situation. I think your code is enabling APPROTECT somehow.

Please check your code to see if something writes to NRF_UICR->APPROTECT or defines ENABLE_APPROTECT.

Regards,

Priyanka