Norco BIS-6660C, User Manual

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BIS-6660C
User Manual
52
Appendix 2
：
Watchdog Programming Guide
watchdog reference code
（
C
）
Write data to corresponding ports in C language to realize different functions of Watchdog
Timer.
Port Instruction:
void main()
{
int indexp = 0x4e,datap = 0x4f;
unsigned char temp;
Outportb(indexp,0x87);
Outportb(indexp,0x87); //unlock
Outportb(indexp,0x2d);
temp = (unsigned char) inportb (datap);
temp &= 0xfe;
Outportb(indexp,0x2d);
Outportb(datap,temp); //set pin for watchdog
Outportb(indexp,0x07);
Outportb(datap,0x08);
Outportb(indexp,0x30);
Outportb(datap,0x01); //enable logical device
Outportb(indexp,0xf5);
Outportb(datap,0x00); //set second
Outportb(indexp,0xf6);
Outportb(datap,0x05); //set 5seconds
Outportb(indexp,0xf7);
Outportb(datap,0x00);
Outportb(indexp,0xaa); //lock
}
If the system crashes, Watchdog enables system to auto reboot.