Acrosser AR-B5630 - Manual (Page 25)

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// Set Watchdog
outportb(IO_Port_Address,0x07); // Point to Logical Device Number Reg.
outportb(IO_Port_Address+1,0x07); // Select logical device 7, (Watchdog Function)
outportb(IO_Port_Address,0x23); // Select Watchdog use CLKIN
outportb(IO_Port_Address+1,inportb(IO_Port_Address+1)|0x10);
outportb(IO_Port_Address,0x72); // Select Watchdog use keyboard reset
outportb(IO_Port_Address+1,0x40);
outportb(IO_Port_Address,0x72); // Select Watchdog count mode seconds or minutes
outportb(IO_Port_Address+1,inportb(IO_Port_Address+1)|0x80); // Set Second
outportb(IO_Port_Address,0x73); // Set Watchdog Timer Value
outportb(IO_Port_Address+1,Time); // 0x00 to disable, max 0xFF