AT91 datasheet(90/153 Pages) ATMEL

90 / 153 page

AT91X40 Series

1354D–ATARM–08/02

WD User Interface

WD Base Address: 0xFFFF8000 (Code Label WD_BASE)

WD Overflow Mode Register

Name:WD_OMR

Access:

Read/Write

Reset Value:0

Offset:

0x00

• WDEN: Watch Dog Enable (Code Label WD_WDEN)

0 = Watch Dog is disabled and does not generate any signals.

1 = Watch Dog is enabled and generates enabled signals.

• RSTEN: Reset Enable (Code Label WD_RSTEN)

0 = Generation of an internal reset by the Watch Dog is disabled.

1 = When overflow occurs, the Watch Dog generates an internal reset.

• IRQEN: Interrupt Enable (Code Label WD_IRQEN)

0 = Generation of an interrupt by the Watch Dog is disabled.

1 = When overflow occurs, the Watch Dog generates an interrupt.

• EXTEN: External Signal Enable (Code Label WD_EXTEN)

0 = Generation of a pulse on the pin NWDOVF by the Watch Dog is disabled.

1 = When an overflow occurs, a pulse on the pin NWDOVF is generated.

• OKEY: Overflow Access Key (Code Label WD_OKEY)

Used only when writing WD_OMR. OKEY is read as 0.

0x234 = Write access in WD_OMR is allowed.

Other value = Write access in WD_OMR is prohibited.

Table 12. WD Memory Map

Offset

Name

Access

Reset State

0x00

Overflow Mode Register

WD_OMR

Read/Write

0x04

Clock Mode Register

WD_CMR

Read/Write

0x08

Control Register

WD_CR

Write Only

–

0x0C

Status Register

WD_SR

Read Only

––

–––

––

–

––

–––

––

–

OKEY

EXTEN

IRQEN

RSTEN

WDEN

AT91 Datasheet(PDF) 90 Page - ATMEL Corporation

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