Norco SHB-940, Руководство пользователя, Страница: 70 / 74

SHB-940
Intel
®
Q45 based PICMG1.3 Full Size CPU Card
57
Appendix 3 ： Watchdog programming guide
Watchdog reference code
（
ASM
）
--------------------------------------------------------------------------------------------------------------
Set the port to realize watchdog function through DEBUG order, so that it can carry out
Watchdog Timer
′
s various functions.
port instruction
：
2EH
：
Address register
2FH
：
Data register
Example
：
Set Watchdog Timer for 48 Seconds, DEBUG in DOS
：
-----------------------------------------------------------------
C:\>debug
-o 2e 87
；
Decode
-o 2e 87
-o 2e 2d ; Select watchdog pin
-o 2f e0
-o 2e 07 ; Select logic devices
-o 2f 08
-o 2e 30 ; Boot logic devices
-o 2f 01
-o 2e f5
-o 2f 00 ; Set timer units as second /(set as min: o 2f 08)
-o 2e f6
-o 2f 30 ; Set Timer Count to 48 sec.(Max support FF = 255 , when it set as 00
Watchdog function stop)
-o 2fe aa ; Lock register
-q
C :\>
Upon the last line, Press
“
Enter
”
, then system will reboot after counting 48 seconds