Advantech PCA-6008VG, Руководство пользователя

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PCA-6008VG User Manual 60
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
theW83627HF
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 sec-
ond 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) 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
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