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.
ꢂ CN1: Reset Button Connector
PIN
1
2
Description
GND
1
2
Reset
ꢂ CN3: HDD LED Connector
PIN
1
2
Description
1
2
Pull 150Ω to +5V
HDD LED
ꢂ CN4: Power LED Connector
PIN
1
2
Description
1
2
Pull 330Ω to +5V
GND
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:
;----------------------------------------------------------------
;Enter the WDT function mode, interruptible double-write
;----------------------------------------------------------------
MOV
MOV
OUT
OUT
MOV
MOV
OUT
MOV
DX, 2EH
AL, 87H
DX, AL
DX, AL
DX, 2EH
AL, 07H
DX, AL
DX, 2FH
MOV
AL, 08H
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