7.4 Power-on Reset and Brown-out Detector

The SAM C20/C21 embed three features to monitor, warn, and reset the device:

• POR: Power-on Reset on VDDIN and VDDIO
• BODVDD: Brown-out Detector on VDDIN
• BODCORE: Voltage Regulator Internal Brown-out Detector on VDDCORE. The Voltage Regulator Internal BOD is calibrated in production and its calibration configuration is stored in the NVM User Row. For additional information, refer to the NVM user Row Mapping. This configuration should not be changed if the user row is written to assure the correct behavior of the BODCORE. This configuration is automatically copied at boot-up in the BODCORE registers.