Datasheet

To write the NVM User Row refer to NVMCTRL – Non-Volatile Memory Controller.
Note that when writing to the user row the values do not get loaded by the other modules on the device
until a device reset occurs.
Table 10-4. NVM User Row Mapping
Bit Position Name Usage
2:0 BOOTPROT Used to select one of eight different bootloader sizes. Refer to
NVMCTRL – Non-Volatile Memory Controller. Default value = 7
except for WLCSP (Default value = 3).
3 Reserved
6:4 EEPROM Used to select one of eight different EEPROM sizes. Refer to
NVMCTRL – Non-Volatile Memory Controller. Default value = 7.
7 Reserved
13:8 BOD33 Level BOD33 Threshold Level at power on. Refer to SYSCTRL BOD33
register.
Default value = 0x7 (non-AECQ100)
Default value = 0x22 (AECQ100)
14 BOD33 Enable BOD33 Enable at power on . Refer to SYSCTRL BOD33 register.
Default value = 1.
16:15 BOD33 Action BOD33 Action at power on. Refer to SYSCTRL BOD33 register.
Default value = 1.
24:17 Reserved Voltage Regulator Internal BOD (BOD12) configuration. These bits
are written in production and must not be changed. Default value =
0x70.
25 WDT Enable WDT Enable at power on. Refer to WDT CTRL register.
Default value = 0.
26 WDT Always-On WDT Always-On at power on. Refer to WDT CTRL register.
Default value = 0.
30:27 WDT Period WDT Period at power on. Refer to WDT CONFIG register.
Default value = 0x0B.
34:31 WDT Window WDT Window mode time-out at power on. Refer to WDT CONFIG
register.
Default value = 0x05.
38:35 WDT EWOFFSET WDT Early Warning Interrupt Time Offset at power on. Refer to WDT
EWCTRL register. Default value = 0x0B.
39 WDT WEN WDT Timer Window Mode Enable at power on. Refer to WDT CTRL
register. Default value = 0.
40 BOD33 Hysteresis BOD33 Hysteresis configuration at power on. Refer to SYSCTRL
BOD33 register.
Default value = 0.
SAM D21 Family
Memories
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 43