Advantech AIMB-223G2-S2A2E, User Manual

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AIMB-223 User Manual 64
Table A.1: Watchdog Timer Registers
Address of Register (2E) Attribute
Read/Write Value (2F) &
description
87 (hex) ----- Write this address to I/O address port 2E (hex)
twice to unlock the W83627DHG-P.
07 (hex) write Write 08 (hex) to select register of watchdog timer.
30 (hex) write Write 01 (hex) to enable the function of the watch-
dog 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 minutes 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 watch-
dog 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 7:Write 1 to enable mouse to reset the timer, 0
to disable[default]. Bit 6: Write 1 to enable key-
board to reset the timer, 0 to disable.[default]
Bit 5: Write 1 to generate a timeout signal immedi-
ately and automatically return to 0. [default=0]
Bit 4: Read status of watchdog timer, 1 means
timer is “timeout”.
AA (hex) ----- Write this address to I/O port 2E (hex) to lock the
watchdog timer 2.