Arkon AIMB-258 user manual Programming the Watchdog Timer, Watchdog timer overview

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A.1 Programming the Watchdog Timer

The AIMB-258's watchdog timer can be used to monitor system software operation and take corrective action if the software fails to function after the programmed period. This section describes the operation of the watchdog timer and how to pro- gram it.

A.1.1 Watchdog timer overview

The watchdog timer is built into the super I/O controller W83627UHG. 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 or 1 to 255 minutes.

!Generates an interrupt or resets signal if the software fails to reset the timer after time-out.

A.1.2 Programming the Watchdog Timer

The I/O port address of the watchdog timer is 2E(hex) and 2F(hex).

2E (hex) is the address port. 2F(hex) is the data port.

You must first assign the address of register by writing address value into address port 2E(hex), then write/read data to/from the assigned register through data port 2F (hex).

AIMB-258 User Manual

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Contents AIMB-258 Safety Information Electrical safetyCertifications Technical Support Packing ListContents Bios Operation Appendix BTable B.3 DVI Connector VGA1B Viii Chapter Before You Proceed Placement DirectionMotherboard Overview Product Introduction Screw HolesMotherboard Layout Motherboard LayoutSpecifications PCIOperating System support list Operation System AIMB-258Board Diagram ChapterOrdering Information Bracket View AccessoriesRiser Card Layout Content List Jumper Setting ListJSETCOM2 COM2 RS232/422/485 Mode Selection JSETCOM1 COM1/+5 V/+12 V SelectionPSON1 ATX, AT Mode Selection J1LCD Power 3.3 V/5.5 V SelectionCMOS1 Clear Cmos Central Processing Unit CPU for AIMB-258 JWDT1 Watchdog Timer Output OptionJobs HW monitor Installing the CPU Product Introduction Installing the CPU Heatsink and Fan Motherboard HoleProduct Introduction Uninstalling the CPU Heatsink and Fan Dimm Sockets Location System MemorySystem Memory Memory Support List Sodimm DDR3Connectors Rear Panel Connectors10 Rear Panel Connectors 11 LEDsCPU Fan Connector CPUFAN1 System Fan Connector SYSFAN1, SYSFAN2 Page Front Panel Connector JFP1/JFP2/JFP3 ATX soft power switch JFP1 / PwrswReset JFP1 / Reset HDD LED JFP2 / HddledUSB 2.0 Connector USB56, USB78 Power LED and keyboard lock connector JFP312 ATX power supply LED status No support for AT power ATX Power Connector ATX1 Important notes on the Motherboard Power RequirementsLCD Inverter Connector VP1 Lvds Connector LVDS1 SATA1 SATA2 PCIe x 16 Slot Pcie X SPI Flash ConnectorSPICN1 Product Introduction CF connector Bios Operation Bios Introduction Bios SetupMain Menu Standard Cmos Features Advanced Bios Features Advanced Chipset Features Integrated Peripherals Onboard Device Super IO DeviceUSE Device Setting Power Management Setup Power Management User Defined Suspend Mode DisabledHDD Power Down Mode Disabled PowerOn by LAN Enabled8 PnP/PCI Configurations PC Health StatusLoad Setup Defaults Set Password CPU Warning TemperatureCurrent System Temperature Current CPU TemperatureTo Change Password To Establish PasswordTo Disable Password Chipset Software Install Utility Before you Begin IntroductionWindows Vista/XP Driver Setup Page VGA Setup Introduction LAN Configuration Installation FeaturesWindows Vista/XP Driver Setup Realtek RTL8111C LAN Configuration Page Appendix a Watchdog timer overview Programming the Watchdog TimerProgramming the Watchdog Timer Appendix a Programming the Watchdog Timer Table A.1 Watchdog Timer Registers Example Program Page Appendix a Programming the Watchdog Timer Page Appendix B VGA Connector VGA1A USB Connector USB56,USB78DVI Connector VGA1B RS-232 Serial Port COM1~COM2 Table B.4 RS-232 Serial Port COM1~COM2RS-232 Serial Port COM3 ~ COM6 Table B.5 RS-232 Serial Port COM23PS/2 Keyboard/ Mouse Connector KBMS1 CPU Fan Power Connector CPUFAN1Table B.6 PS/2 Keyboard/ Mouse Connector KBMS1 Table B.7 CPU Fan Power Connector CPUFAN1Table B.8 Power LED and Keylock Connector JFP3 Power LED & Keyboard Lock Connector JFP3Table B.9 External Speaker Connector JFP2/SPEAKER Table B.10 Audio Front Panel Connector JFP1/ Reset Audio Front Panel Connector FPAUD1Table B.11 Audio front panel connector FPAUD1 Gpio Pin Header GPIO1 Table B.12 Gpio Pin Header GPIO1Lvds Connector LVDS1 Table B.13 Lvds Connector LVDS1Lvds Power Jumper J1 Table B.14 Lvds Power Jumper J1Lvds Invert VP1 Table B.15 Lvds Invert VP1System I/O Ports DMA Channel AssignmentsTable B.16 System I/O Ports Table B.17 DMA Channel AssignmentsInterrupt Assignments 19 1st MB Memory MapTable B.18 Interrupt Assignments Table B.19 1st MB Memory MapAppendix B Pin Assignments