Watch Dog Timer - Nexcom PEAK 6320A User Manual

PEAK 6320A Series User's Guide
Appendix 1

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
Watch Dog Timer
WDT Time out active for
WDT Active Time
Watch Dog Timer
F2 Default at F2
Disabled 1. Default at disabled
Enabled 2. Enabled for user's programming
Reset Default at Reset
NMI
1 sec Default at 64 sec
2 sec
4 sec
8 sec
16 sec
32 sec
64 sec
A1-1