hs-72501 BOSER Technology Co., Ltd, hs-72501 Datasheet - Page 25

• Manufacturer Part Number: hs-72501
• Description: Intel?? Pentium?? M/celeron??m/ Intel?? Celeron?? Processor Pci-isa/isa Single Board Computer
• Manufacturer: BOSER Technology Co., Ltd

3.16 System Front Panel Control
The HS-7250/HS-7650 series has one LED at location CN3 that
indicates the system front panel status. This visual feature of the HDD
LED may also be connected to and external HDD LED via connector
CN8. At location CN1 is reset button.
3.17 Watchdog Timer
Once the Enable cycle is active a Refresh cycle is requested before the
time-out period. This restarts counting of the WDT period. When the
time counting goes over the period preset of WDT, it will assume that
the program operation is abnormal. A system reset signal will restart
when such error happens.
The following sample programs show how to enable, disable and
refresh the watchdog timer:
CN1: Reset Button Connector
CN3: HDD LED Connector
CN4: Power LED Connector
;----------------------------------------------------------------
;Enter the WDT function mode, interruptible double-write
;----------------------------------------------------------------
PIN
PIN
PIN
MOV
MOV
OUT
OUT
MOV
MOV
OUT
MOV
MOV
1
2
1
2
1
2
DX, 2EH
AL, 87H
DX, AL
DX, AL
DX, 2EH
AL, 07H
DX, AL
DX, 2FH
AL, 08H
Pull 150Ω to +5V
Pull 330Ω to +5V
Description
Description
Description
HDD LED
Reset
GND
GND
1
2
1
2
1
2
19