User manual

PCI-7030 User Manual 58
Table A.1: Watchdog Timer Registers
Address of Register (2E) Attribute
Read/Write Value (2F) & description
87(hex)/01(hex)/55(hex)/
9 (hex)/01(hex)/55(hex)/
55(
----- Write this value to I/O address port 2E (hex)
55(hex) to unlock the IT8718F.
07 (hex) write Write 07 (hex) to select LDN (Logic Device
Number)
of GPIO Configuration Register
72 (hex) write Set seconds or minutes as units for the timer.
Write 0 to bit 7: set minute as counting unit.
[default]
Write 1 to bit 7: set second as counting unit.
73 (hex) Read/write Watch Dog Timer-out Value (LSB)
74 (hex) Read/write Watch Dog Timer-out Value (MSB)
74&73 value 01~FFFF (hex): The amount of the
count, in seconds
or minutes, depends on the value set in register
72
(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
AA (hex) ----- value.
IT8718F.