23.7.1 Reset Cause

When a Reset occurs, the bit corresponding to the Reset source is set to '1' and all other bits are written to '0'.
Name: RCAUSE
Offset: 0x00
Property: –

Bit 76543210 
  SYSTWDTEXTBOD12PLLBOD33BOD12POR 
Access RRRRRRR 
Reset xxxxxxx 

Bit 6 – SYST System Reset Request

This bit is set if a System Reset Request has occurred. Refer to the Cortex processor documentation for more details.

Bit 5 – WDT Watchdog Reset

This bit is set if a Watchdog Timer Reset has occurred.

Bit 4 – EXT External Reset

This bit is set if an external Reset has occurred.

Bit 3 – BOD12PLL  Brown Out on VDDPLL Detector Reset

This bit is set if a BOD12PLL (VDDPLL) Reset has occurred.

Bit 2 – BOD33  Brown Out on AVDD/VDD Detector Reset

This bit is set if a BOD33 (AVDD/VDD) Reset has occurred.

Bit 1 – BOD12  Brown Out on VDDCORE Detector Reset

This bit is set if a BOD12 (VDDCORE) Reset has occurred.

Bit 0 – POR Power On Reset

This bit is set if a POR has occurred.