KINO-DAL SBC
Page 133
NOTE:
The following discussion applies to DOS. Contact IEI support or visit the IEI
website for drivers for other operating systems.
The Watchdog Timer is a hardware-based timer that attempts to restart the system when it
stops working. The system may stop working because of external EMI or software bugs.
The Watchdog Timer ensures that standalone systems like ATMs will automatically
attempt to restart in the case of system problems.
A BIOS function call (INT 15H) is used to control the Watchdog Timer.
INT 15H:
AH – 6FH Sub-function:
AL – 2:
Sets the Watchdog Timer’s period.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table F-1: AH-6FH Sub-function
Call sub-function 2 to set the time-out period of Watchdog Timer first. If the time-out value
is not zero, the Watchdog Timer starts counting down. When the timer value reaches zero,
the system resets. To ensure that this reset condition does not occur, calling sub-function
2 must periodically refresh the Watchdog Timer. However, the watchdog timer is disabled
if the time-out value is set to zero.
A tolerance of at least 10% must be maintained to avoid unknown routines within the
operating system (DOS), such as disk I/O that can be very time-consuming.
Summary of Contents for KINO-DAL-E1W2
Page 14: ......
Page 15: ...KINO DAL SBC Page 1 Chapter 1 1 Introduction...
Page 24: ...KINO DAL SBC Page 10 Chapter 2 2 Unpacking...
Page 28: ...KINO DAL SBC Page 14 Chapter 3 3 Connectors...
Page 67: ...KINO DAL SBC Page 53 Chapter 4 4 Installation...
Page 87: ...KINO DAL SBC Page 73 Chapter 5 5 BIOS...
Page 129: ...KINO DAL SBC Page 115 Chapter 6 6 Software Drivers...
Page 132: ...KINO DAL SBC Page 118 Appendix A A Regulatory Compliance...
Page 134: ...KINO DAL SBC Page 120 B Product Disposal Appendix B...
Page 136: ...KINO DAL SBC Page 122 Appendix C C BIOS Menu Options...
Page 139: ...KINO DAL SBC Page 125 Appendix D D Terminology...
Page 143: ...KINO DAL SBC Page 129 Appendix E E Digital I O Interface...
Page 146: ...KINO DAL SBC Page 132 Appendix F F Watchdog Timer...
Page 149: ...KINO DAL SBC Page 135 Appendix G G Hazardous Materials Disclosure...