Note: There is no way to recover after
NVMACCDIS is selected: it is not possible to re-enable UPDI access for the
device programming. Ensure that the consequences of enabling this feature are
fully comprehended before enabling this mode: Chip Erase and User Row write are
blocked, and any programming needs to go through a bootloader in the Boot Code
section.
Note: After NVMACCDIS activation, access to NVM is very
restricted for external testing. Some testing will be possible, but advanced
failure analysis will not be possible. The CRC status is available.
Value | Name | Description |
---|
Other | - | Reserved |
0x2 | NVMACCDIS | Program
and Debug Interface Disable (PDID): NVM access through UPDI is permanently
disabled |
0x3 | UNPROT | The UPDI peripheral and the UPDI pin are working as
described in the UPDI section |