Global American 3301260, Manual

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3.17 System Front Panel Connectors
The 3301260/3304000 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 an external HDD LED via connector
CN8 . At
location CN1 is Reset button connector.
z
CN1: Reset Button Connector
PIN Description
1 2
1 GND
2 Reset
z CN3: HDD LED Connector
PIN Description
1 2
1 VCC
2 HDD LED
z
CN4: Power LED Connector
PIN Description
1 2
1 150 Pull +5V
2 Suspend LED
3.18 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
re-start 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 DX, 2EH
MOV AL, 87H
OUT DX, AL
OUT DX, AL
MOV DX, 2EH
MOV AL, 07H
OUT DX, AL
MOV DX, 2FH
MOV AL, 08H
OUT DX, AL
MOV DX, 2EH
MOV AL, F5H
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