IBM SBC-658 manual SelectDevice8 //Set Register F2

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)

{

EnterConfigMode();

SelectDevice(8); //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();

}

100SBC-658 User's Manual