PC87366 datasheet(140/240 Pages) NSC

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7.0 WATCHDOG Timer (WDT) (Continued)

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7.3.3

WATCHDOG Mask Register (WDMSK)

This register is used to determine which system events (IRQ) are enabled as WATCHDOG Timer trigger events. An enabled

IRQ event becomes a trigger event that causes the timer to reload the WDTO and restart the countdown.

This register enables or masks the trigger events that restart the WATCHDOG timer.

Location:

Offset 01h

Type:

R/W

Bit

7654

Name

Reserved

Serial Port 2

IRQ Trigger

Enable

Serial Port 1

IRQ Trigger

Enable

Mouse IRQ

Trigger

Enable

KBD IRQ

Trigger

Enable

Reset

0000

Bit

Description

7-4

Reserved

Serial Port 2 IRQ Trigger Enable. This bit enables the IRQ assigned to Serial Port 2 to trigger WATCHDOG

Timer reloading.

0: Serial Port 2 IRQ not a trigger event

1: An active Serial Port 2 IRQ enabled as a trigger event

Serial Port 1 IRQ Trigger Enable. This bit enables the IRQ assigned to Serial Port 1 to trigger WATCHDOG

Timer reloading.

0: Serial Port 1 IRQ not a trigger event

1: An active Serial Port 1 IRQ enabled as a trigger event

Mouse IRQ Trigger Enable. This bit enables the IRQ assigned to the Mouse to trigger WATCHDOG Timer

reloading.

0: Mouse IRQ not a trigger event

1: An active Mouse IRQ enabled as a trigger event

KBD IRQ Trigger Enable. This bit enables the IRQ assigned to the Keyboard to trigger reloading of the

WATCHDOG timer.

0: Keyboard IRQ not a trigger event

1: An active Keyboard IRQ enabled as a trigger event

PC87366 Datasheet(PDF) 140 Page - National Semiconductor (TI)

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