Arkon AIMB-258 user manual Table A.1 Watchdog Timer Registers

Table A.1: Watchdog Timer Registers

Address of register (2E)	Attribute
Read/Write	Value (2F) and description
87 (hex)	-	Write this address to I/O address port 2E
		(hex) twice to unlock the W83627UHG
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 num-
		ber 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)	read/write	Bit 6: Write 1 to enable keyboard to reset
		the timer, 0 to disable.[default]
		Bit 5: Write 1 to generate a timeout sig-
		nal 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.

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