Advantech MIC-3318 manual Address Register 2E Attribute Description

Table A-1: Watchdog timer registers

Address of
register (2E)	Attribute		Description
Read/Write	Value (2F)
	and
	description
87 (hex)	-----	Write this address to I/O address
		port 2E (hex) twice to unlock the
		W83627HF
07 (hex)	write	Write 08 (hex) to select register of
		watchdog timer.
30 (hex)	write	Write 01 (hex) to enable the function of
		the watchdog timer. Disabled is set as
		default.
F5 (hex)	write	Set seconds or minutes as units for
		the timer.

Write 0 to bit 3: set second as counting unit. [default]

Write 1 to bit 3: set minute as counting unit

F6 (hex)	write	0: stop timer [default]01~FF (hex): The
		amount of the count, in seconds or
		minutes, depends on the value set in
		register F5 (hex). This number
		decides how long the watchdog timer
		waits for strobe before generating an
		interrupt or reset signal. Writing a new
		value to this register can reset the
		timer to count with the new value.
F7 (hex)	rd/wr	Bit 6: Write 1 to enable keyboard to
		reset the timer, 0 to disable.[default]
		Bit 5: Write 1 to generate a timeout
		signal immediately and automatically
		return to 0. [default=0] Bit 4: Read
		status of watchdog timer, 1 means
		timer is "time out".
AA (hex)	-----	Write this address to I/O port 2E (hex)
		to lock the watchdog timer.2

Appendix A Programming the Watchdog Timer 55