PC87360 Datasheet, PDF (125/168 Pages) National Semiconductor (TI) – 128-Pin LPC SuperI/O with Protection and Extensive GPIO Support

7.0 WATCHDOG Timer (WDT) (Continued)
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
Name
Reset
7
6
5
4
3
2
1
0
Reserved
Serial Port 2 Serial Port 1 Mouse IRQ KBD IRQ
IRQ Trigger IRQ Trigger Trigger Trigger
Enable
Enable
Enable Enable
0
0
0
0
0
0
0
0
Bit
Description
7-4 Reserved
3 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
2 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
1 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
0 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
125
www.national.com