Power-On Reset and Brown-Out Detector

The SAM D20 embeds three features to monitor, warn and/or reset the device:

• POR: Power-On Reset on VDDANA
• BOD33: Brown-Out Detector on VDDANA
• BOD12: 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. This configuration should not be changed if the user row is written to assure the correct behavior of the BOD12.