![background image](http://html1.mh-extra.com/html/advantech/asmb-825-00a1e/asmb-825-00a1e_user-manual_2858347108.webp)
ASMB-825 User Manual
100
The ASMB-825’s watchdog timer can be used to monitor system software operation
and take corrective action if the software fails to function within the programmed
period. This section describes the operation of the watchdog timer and how to pro-
gram it.
A.1
Watchdog Timer Overview
The watchdog timer is built in to the EC controller IT8528E. It provides the following
functions for user programming:
Can be enabled and disabled by user’s program
Timer can be set from 1 to 255 seconds
Generates an interrupt or reset signal if the software fails to reset the timer
before time-out
A.2
Programming the Watchdog Timer
The I/O port address of the watchdog timer is as below:
Here is an example to step by step program the Watchdog Timer.
Address
Description
0x57
Event - Warm Reset: 0x04
0x5E
Warm Reset Timer (High BYTE)
Based 100ms
0x5F
Warm Reset Timer (Low BYTE)
Step Action
Description
00
Read 0x299 port
Clear I/O port
Wait IBF clear
0x29A, BIT1, = 0
01
Write 0x89 to 0x29A
Wait IBF clear
0x29A, BIT1, = 0
02
Write 0x5E to 0x299 port
Wait IBF clear
0x29A, BIT1, = 0
03
Write 0x00 to 0x299 port
Set 10 sec (high byte)
Wait IBF clear
0x29A, BIT1, = 0
04
Write 0x89 to 0x29A
Wait IBF clear
0x29A, BIT1, = 0
05
Write 0x5F to 0x299 port
Wait IBF clear
0x29A, BIT1, = 0
06
Write 0x64 to 0x299 port
Set 10 sec (low byte)
Wait IBF clear
0x29A, BIT1, = 0
07
Write 0x89 to 0x29A
Wait IBF clear
0x29A, BIT1, = 0
Summary of Contents for ASMB-825-00A1E
Page 8: ...ASMB 825 User Manual viii...
Page 9: ...Chapter 1 1 Overview...
Page 20: ...ASMB 825 User Manual 12...
Page 21: ...2 Connections Chapter 2...
Page 37: ...Chapter 3 3 AMI BIOS...
Page 47: ...39 ASMB 825 User Manual Chapter 3 AMI BIOS 3 2 2 7 Serial Port Console Redirection...
Page 77: ...69 ASMB 825 User Manual Chapter 3 AMI BIOS...
Page 79: ...71 ASMB 825 User Manual Chapter 3 AMI BIOS...
Page 83: ...75 ASMB 825 User Manual Chapter 3 AMI BIOS CPU P State Control...
Page 84: ...ASMB 825 User Manual 76...
Page 85: ...77 ASMB 825 User Manual Chapter 3 AMI BIOS CPU C State Control...
Page 86: ...ASMB 825 User Manual 78...
Page 96: ...ASMB 825 User Manual 88...
Page 97: ...Chapter 4 4 Chipset Software Installation Utility...
Page 100: ...ASMB 825 User Manual 92...
Page 101: ...Chapter 5 5 Graphic Setup...
Page 103: ...Chapter 6 6 LAN USB 3 0 and RSTe RAID...
Page 106: ...ASMB 825 User Manual 98...
Page 107: ...Appendix A A Programming the Watchdog Timer...
Page 110: ...ASMB 825 User Manual 102...
Page 111: ...Appendix B B I O Pin Assignments...
Page 121: ...113 ASMB 825 User Manual Appendix B I O Pin Assignments...