Peak Peak 632A, Руководство пользователя

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PEAK 632A Series User 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