13.3.2.1 Reset Sources
There are two kinds of sources for Resets:
- Power supply Resets, which are caused by changes in the power supply voltage: Power-on Reset (POR) and Brown-out Detector (BOD).
- User Resets, which are issued by the application, by the debug operation, or by pin changes (Software Reset, Watchdog Reset, UPDI Reset, and external Reset pin RESET).