Advantech AIMB-788, User Manual, Page: 100 / 114

AIMB-788 User Manual 90
Table A.1: Watchdog timer registers
Address of
register (2E)
Read/
Write
Value (2F) & description.
87 (hex) -
Write this address to I/O address port 2E (hex) twice to unlock the
NCT6126D.
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.
Enabled is set as default.
F0 (hex) write
Set seconds or minutes as units for the timer. Write 0 to bit 3: set
seconds as counting unit. [default]. Write 1 to bit 3: set minutes as
counting unit.
F1 (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 F0 (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.
F2 (hex)
read/
write
Bit 6: Write 1 to enable keyboard to reset the timer, 0 to dis -
able.[default]
Bit 5: Write 1 to generate a timeout signal immediately and auto -
matically 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 NCT6126D.