User manual

PCA-6011 User Manual 68
Table A.1: Watchdog Timer Registers
Address of
Register (2E)
Attribute 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
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 minutes as counting unit
F6 (hex) write
0: stop timer [default]
01~FF (hex): The amount of the count, in sec-
onds 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 7: Write 1 to enable mouse to reset the
timer, 0 to disable.[default]
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 “timeout”.
AA (hex) -----
Write this address to I/O port 2E (hex) to lock
the watchdog timer 2.