Datasheet

Table 16-2. Effects of the Different Reset Events
Power Reset User Reset
POR, BOD12,
BOD33
External Reset WDT Reset,
SysResetReq
RTC
All the 32kHz sources
WDT with ALWAYSON feature
Generic Clock with WRTLOCK
feature
Y N N
Debug logic Y Y N
Others Y Y Y
The external reset is generated when pulling the RESET pin low. This pin has an internal pull-up, and
does not need to be driven externally during normal operation.
The POR, BOD12 and BOD33 reset sources are generated by their corresponding module in the System
Controller Interface (SYSCTRL).
The WDT reset is generated by the Watchdog Timer.
The System Reset Request (SysResetReq) is a software reset generated by the CPU when asserting the
SYSRESETREQ bit located in the Reset Control register of the CPU (See the ARM
®
Cortex
®
Technical
Reference Manual on http://www.arm.com).
Figure 16-3. Reset Controller
RESET CONTROLLER
BOD12
BOD33
POR
WDT
RESET
RESET SOURCES
RTC
32kHz clock sources
WDT with ALWAYSON
Generic Clock with
WRTLOCK
Debug Logic
Others
CPU
RCAUSE
SAM D21 Family
PM – Power Manager
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 146