User`s manual

Watchdog Timer 65
M-322
Appendix A - Watchdog Timer
The following is a sample program for configuring the M-322’s
watchdog timer.
A.1 Sample Code
Unlock W83627DHG-A:
outportb(0x2E, 0x87) ;Unlock Super I/O
Select Logical Device:
outportb(0x2E, 0x07) ;Select device number register
outportb(0x2F, 0x08) ;Set to Logical Device 8
Activate WDT:
outportb(0x2E, 0x30) ;Select WDTO# activate register
outportb(0x2F, 0x01) ;Enable watchdog
Set Seconds or Minutes:
outportb(0x2E, 0xF5) ;Select WDTO# control register
outportb(0x2F, mode) ;where mode=0x00(Sec) or 0x08(Min)
Set base timer:
outportb(0x2E, 0xF6) ;Select WDTO# counter register
outportb(0x2F, timeout) ;where timeout=0x00~0xFF
Reset timeout counter:
outportb(0x2E, 0xF6) ;Select WDTO# counter register
outportb(0x2F, timeout) ;where timeout=0x00~0xFF}