PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-
6
Note: Watch Dog Timer
Watch Dog Timer Working Procedure
The Watch Dog Timer (WDT) is the special hardware device. The WDT function
is to monitor the computer system whether work normally, otherwise, it will
have some measures to fix up the system.
It contains a receivable SQW signal from RTC, and could set time and can clear
the counter function. When time is up, WDT can send Reset or NMI signal.
Operator has to write a value into WDT Configuration Register (Write the control
value to the Configuration Port), and clear WDT counter (read the Configuration
Port).
Watch Dog Timer character and function
WDT Configuration port
F2
Default at F2
Watch Dog Timer
Disabled
1. Default at disabled
Enabled
2. Enabled for user
′
s programming
WDT Time out active for
Reset
Default at Reset
NMI
WDT Active Time
1 sec
2 sec
4 sec
8 sec
16 sec
32 sec
64 sec
Default at 64 sec
