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PCI-6871 Users’ Manual 112

Appendix A Programming the Watchdog

Timer

A.1 Supported Input Timing Modes

In order to program the watchdog timer, you must write a program which

writes I/O port address 443 (hex). The output data is a value of time inter-

val. The value range is from 01 (hex) to 3E (hex), and the related time

interval is 1 sec. to 62 sec.

Data Time Interval

01 1 sec.

02 2 sec.

03 3 sec.

04 4 sec.

3E 62 sec.

After data entry, your program must refresh the watchdog timer by

rewriting the I/O port 443 (hex) while simultaneously setting it.

When you want to disable the watchdog timer, your program

should read I/O port 443 (hex).

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Ibm CFC2 Manual do Utilizador Página 120