AAEON ETX-LN - Manual (Page 58)

E T X C P U M o d u l e E T X - L N
Appendix A Programming the Watchdog Timer A-6
= 1 Force Watchdog Timer time-out
event: this bit is self-clearing
Bit 4 : Watchdog Timer Status. R/W
= 1 Watchdog Timer time-out occurred
= 0 Watchdog Timer counting
Bit 3-0 : These bits select IRQ resource for
Watchdog. Setting of 2 selects SMI.