# SAM3XA RSTC

## Reset Controller (RSTC) User Interface

### Registers

Register Mapping
Address | Register | Name | Access | Reset
--- | --- | --- | --- | ---
0x400E1A00 | Control Register | RSTC_CR | write-only | -
0x400E1A04 | Status Register | RSTC_SR | read-only | 0x00000000
0x400E1A08 | Mode Register | RSTC_MR | read-write | 0x00000001

### Register Fields

#### RSTC Control Register

Name: RSTC_CR

Access: write-only

Address: 0x400E1A00

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
- | - | - | - | EXTRST | PERRST | - | PROCRST

- PROCRST: Processor Reset

  Value | Name | Description
  --- | --- | ---
  0 | - | No effect.
  1 | - | If KEY is correct, resets the processor.

- PERRST: Peripheral Reset

  Value | Name | Description
  --- | --- | ---
  0 | - | No effect.
  1 | - | If KEY is correct, resets the peripherals.

- EXTRST: External Reset

  Value | Name | Description
  --- | --- | ---
  0 | - | No effect.
  1 | - | If KEY is correct, asserts the NRST pin.

- KEY: Password

-

#### RSTC Status Register

Name: RSTC_SR

Access: read-only

Address: 0x400E1A04

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

- URSTS: User Reset Status

  Value | Name | Description
  --- | --- | ---
  0 | - | No high-to-low edge on NRST happened since the last read of RSTC_SR.
  1 | - | At least one high-to-low transition of NRST has been detected since the last read of RSTC_SR.

- RSTTYP: Reset Type

-

- NRSTL: NRST Pin Level

-

- SRCMP: Software Reset Command in Progress

  Value | Name | Description
  --- | --- | ---
  0 | - | No software command is being performed by the reset controller. The reset controller is ready for a software command.
  1 | - | A software reset command is being performed by the reset controller. The reset controller is busy.

#### RSTC Mode Register

Name: RSTC_MR

Access: read-write

Address: 0x400E1A08

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
- | - | - | - | ERSTL
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
- | - | - | URSTIEN | - | - | - | URSTEN

- URSTEN: User Reset Enable

  Value | Name | Description
  --- | --- | ---
  0 | - | The detection of a low level on the pin NRST does not generate a User Reset.
  1 | - | The detection of a low level on the pin NRST triggers a User Reset.

- URSTIEN: User Reset Interrupt Enable

  Value | Name | Description
  --- | --- | ---
  0 | - | USRTS bit in RSTC_SR at 1 has no effect on rstc_irq.
  1 | - | USRTS bit in RSTC_SR at 1 asserts rstc_irq if URSTEN = 0.

- ERSTL: External Reset Length

-

- KEY: Password

-