Aaeon PCM-6892 Manual page 94

void SelectDevice(unsigned char device)
{
outportb(IO_INDEX_PORT, DEVICE_REGISTER);
outportb(IO_DATA_PORT, device);
}
unsigned char ReadAData(short int reg)
{
outportb(IO_INDEX_PORT, reg);
return (inportb(IO_DATA_PORT));
}
void WriteAData(unsigned char reg, unsigned char data)
{
outportb(IO_INDEX_PORT, reg);
outportb(IO_DATA_PORT, data);
}
void SetWatchDogTime(unsigned char time_val)
{
//Enter W83977 Configure Mode
EnterConfigMode();
//Select Device 8
SelectDevice(8);
//Set Device Active
WriteAData(0x30, 0x01);
//Set Register F2
//Set Watch-Dog Timer 1~ 256
WriteAData(0xF2, time_val);
// set counter counts in second (or minute)
// Register F4 Bit 6 = 0/1 (minutes/seconds)
// For w83977EF only
WriteAData(0xF4, 0x40);
ExitConfigMode();
}
84 PCM-6892 User's Manual