Watchdog Timer Of Pcm-6893 - Aaeon PCM-6893 User Manual

C o m p a c t B o a r d P C M - 6 8 9 3
A.1 Watchdog timer of PCM-6893
PCM-6893 utilizes W83977 chipset as its watchdog timer controller. Below
are the procedures to complete its configuration PCM-6893 contains a
watchdog timer reset pin. (GP13) All reference material can be found on the
following pages.
A.2 WatchDog timer Setup Utility (for W83977 GP13)
#include <dos.h>
#include <io.h>
#include <bios.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
/* Set I/O Address : 370/371 or 3F0/3F1 */
#define IO_INDEX_PORT 0x370
#define IO_DATA_PORT 0x371
/* Set Watchdog reset pin : 12/13/16 */
#define watch_dog_output_GP 13
#define UNLOCK_DATA 0x87
#define LOCK_DATA 0xAA
#define DEVICE_REGISTER 0x07
void EnterConfigMode()
{
outportb(IO_INDEX_PORT, UNLOCK_DATA);
A-2
Appendix A Pr ogramming the Watchdog Timer