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 |
