Datasheet

– When BBPS.WAKEEN=0, the backup domain will be powered by Main Power, but the device will
stay in backup mode.
• For other exit condition (RTC): The device is kept in battery-powered backup mode until Main Power
is restored to supply the device. Then, the backup domain will be powered by Main Power.
19.6.4 Output Pins
The SUPC can drive two outputs. By writing a '1' to the corresponding Output Enable bit in the Backup
Output Control register (BKOUT.EN), the OUTx pin is driven by the SUPC.
The OUT pin can be set by writing a '1' to the corresponding Set Output bit in the Backup Output Control
register (BKOUT.SETx).
The OUT pin can be cleared by writing a '1' to the corresponding CLR bit (BKOUT.CLRx).
If a RTC Toggle Enable bit is written to '1' (BKOUT.RTCTGLx), the corresponding OUTx pin will toggle
when an RTC event occurs.
19.6.5 Brown-Out Detectors
19.6.5.1 Initialization
Before a Brown-Out Detector (BOD33) is enabled, it must be configured, as outlined by the following:
• Set the BOD threshold level (BOD33.LEVEL)
• Set the configuration in Active, Standby, Hibernate, and Backup modes (BOD33.ACTION,
BOD33.STDBYCFG, BOD33.BKUP, BOD33.RUNHIB, and BOD33.RUNBKUP)
• Set the prescaling value if the BOD will run in sampling mode (BOD33.PSEL)
• Set the action and hysteresis (BOD33.ACTION and BOD33.HYST)
The BOD33 register is Enable-Protected, meaning that they can only be written when the BOD is
disabled (BOD33.ENABLE=0 and STATUS.B33SRDY=0). As long as the Enable bit is '1', any writes to
Enable-Protected registers will be discarded, and an APB error will be generated. The Enable bits are not
Enable-Protected.
19.6.5.2 Enabling, Disabling, and Resetting
After power or user reset, the BOD33 and BOD12 register values are loaded from the NVM User Page.
The BOD33 is enabled by writing a '1' to the Enable bit in the BOD control register (BOD33.ENABLE).
The BOD33 is disabled by writing a '0' to the BOD33.ENABLE.
Related Links
18. PM – Power Manager
9.4 NVM User Page Mapping
19.6.5.3 3.3V Brown-Out Detector (BOD33)
The 3.3V Brown-Out Detector (BOD33) is able to monitor either the VDD or the VBAT supply and
compares the voltage with the brown-out threshold levels.
In all mode except battery backup mode, the BOD33 compares the VDD voltage with the brown-out
threshold level. This level is set in the BOD33 Level field in the BOD33 register (BOD33.LEVEL). When
VDD crosses below the brown-out threshold level, the BOD33 can generate either an interrupt,or a
Reset, or an Automatic Battery Backup Power Switch, depending on the BOD33 Action bit field
(BOD33.ACTION).
In battery backup mode, the BOD33 monitors both the VBAT and VDD supplies alternatively. When VBAT
crosses below the backup brown-out threshold level (BOD33.VBATLEVEL), the BOD33 generates a
SAM D5x/E5x Family Data Sheet
SUPC – Supply Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 241