Appendix
EPE1814V2NAR
43
oldval &= 0xfe;
outportb(DATA_PORT, oldval);
b.
Configure
WDT
to interrupt mode
oldval |= 0x01;
outportb(DATA_PORT, oldval);
outportb(INDEX_PORT,0xf7);
outportb(DATA_PORT, IRQ_NO); /*Please replace the constant
IRQ_NO with the interrupt number need to be used and evaluate the variable IRQ.
The available range of the interrupt number has been listed in the beginning of this
chapter.*/
(3)
Configure WDT to time by minute/second:
a.
Time by minute:
outportb(INDEX_PORT,0xf5);
outportb(DATA_PORT,0x08);
b.
Time by second:
outportb(INDEX_PORT,0xf5);
outportb(DATA_PORT,0x00);
(4)
Enable/Disable
WDT
a.
Enable WDT:
outportb(INDEX_PORT,0xf6);
outportb(DATA_PORT,TIME_OUT_VALUE); /*Please replace the
constant
TIME_OUT_VALUE
with
the
unit
number
of
timeout
value(0x01~0xFF)*/
b.
Disable WDT:
outportb(INDEX_PORT,0xf6);
outportb(DATA_PORT,0x00);
