Nexcom PEAK 6320A, User Manual

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PEAK 6320A Series User’s Guide
Watch Dog Timer A1-1
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 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