Aaeon PCM-4330 Guía de instalación descargar pdf (Pagina 70)

A-64 PCM-4894 User Manual

Watchdog timer demo program

How to program the WATCHDOG TIMER

1. To enable the time-out interval of watchdog timer:

-- output the desired value to port 0x443. The resolution of

watchdog timer is 1 sec. Since the data is of 1 byte, the time-

out interval will be 1 sec ~ 255 sec.

Whenever the value of timer is not zero, the timer will

automatically count down

e.g. outportb(0x443, 30); // set interval to 30 sec and

count down

2. To set the time-out event:

-- output data to port 0x444. The default setting is “reset

system”.

· 0: reset system (default)

· 1, 2, 3: IRQ 10, 15, 11 respectively

· 4: NMI

e.g. outportb(0x444, 0); // set time-out event to

reset-system

3. To disable watchdog timer:

-- output value “0” to port 0x443.

e.g. outportb(0x443, 0); // disable watchdog timer

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Aaeon PCM-4330 Guía de instalación Pagina 70