AAEON PCM-8120 - Manual (Page 57)

C o m p a c t B o a r d P C M - 8 1 2 0
Appendix A Programming the Watchdog Timer A-4
WatchDog Timer Configuration Registers
Configure Control (Index=02h)
This register is write only. Its values are not sticky; that is to
say, a hardware reset will automatically clear the bits, and
does not require the software to clear them.