SAM3XA WDT

Watchdog Timer (WDT) User Interface

Registers

Register Mapping

Address	Register	Name	Access	Reset
0x400E1A50	Control Register	WDT_CR	write-only	-
0x400E1A54	Mode Register	WDT_MR	read-write	0x3FFF2FFF
0x400E1A58	Status Register	WDT_SR	read-only	0x00000000

Register Fields

WDT Control Register

Name: WDT_CR

Access: write-only

Address: 0x400E1A50

31	30	29	28	27	26	25	24
KEY
23	22	21	20	19	18	17	16
-	-	-	-	-	-	-	-
15	14	13	12	11	10	9	8
-	-	-	-	-	-	-	-
7	6	5	4	3	2	1	0
-	-	-	-	-	-	-	WDRSTT

• WDRSTT: Watchdog Restart

  Value	Name	Description
  0	-	No effect.
  1	-	Restarts the Watchdog.

• KEY: Password

-

WDT Mode Register

Name: WDT_MR

Access: read-write

Address: 0x400E1A54

31	30	29	28	27	26	25	24
-	-	WDIDLEHLT	WDDBGHLT	WDD
23	22	21	20	19	18	17	16
WDD
15	14	13	12	11	10	9	8
WDDIS	WDRPROC	WDRSTEN	WDFIEN	WDV
7	6	5	4	3	2	1	0
WDV

• WDV: Watchdog Counter Value

-

• WDFIEN: Watchdog Fault Interrupt Enable

  Value	Name	Description
  0	-	A Watchdog fault (underflow or error) has no effect on interrupt.
  1	-	A Watchdog fault (underflow or error) asserts interrupt.

• WDRSTEN: Watchdog Reset Enable

  Value	Name	Description
  0	-	A Watchdog fault (underflow or error) has no effect on the resets.
  1	-	A Watchdog fault (underflow or error) triggers a Watchdog reset.

• WDRPROC: Watchdog Reset Processor

  Value	Name	Description
  0	-	If WDRSTEN is 1, a Watchdog fault (underflow or error) activates all resets.
  1	-	If WDRSTEN is 1, a Watchdog fault (underflow or error) activates the processor reset.

• WDDIS: Watchdog Disable

  Value	Name	Description
  0	-	Enables the Watchdog Timer.
  1	-	Disables the Watchdog Timer.

• WDD: Watchdog Delta Value

-

• WDDBGHLT: Watchdog Debug Halt

  Value	Name	Description
  0	-	The Watchdog runs when the processor is in debug state.
  1	-	The Watchdog stops when the processor is in debug state.

• WDIDLEHLT: Watchdog Idle Halt

  Value	Name	Description
  0	-	The Watchdog runs when the system is in idle mode.
  1	-	The Watchdog stops when the system is in idle state.

WDT Status Register

Name: WDT_SR

Access: read-only

Address: 0x400E1A58

31	30	29	28	27	26	25	24
-	-	-	-	-	-	-	-
23	22	21	20	19	18	17	16
-	-	-	-	-	-	-	-
15	14	13	12	11	10	9	8
-	-	-	-	-	-	-	-
7	6	5	4	3	2	1	0
-	-	-	-	-	-	WDERR	WDUNF

• WDUNF: Watchdog Underflow

  Value	Name	Description
  0	-	No Watchdog underflow occurred since the last read of WDT_SR.
  1	-	At least one Watchdog underflow occurred since the last read of WDT_SR.

• WDERR: Watchdog Error

  Value	Name	Description
  0	-	No Watchdog error occurred since the last read of WDT_SR.
  1	-	At least one Watchdog error occurred since the last read of WDT_SR.