Advantech AKMB-G41M, User Manual

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AKMB-G41M User Manual 52
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.
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 watchdog
timer waits for strobe before generating an inter-
rupt or reset signal. Writing a new value to this reg-
ister 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.