Advantech PCA-6289 Manual do Utilizador Página 57

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47 Appendix A
A.1.3 Watchdog Timer Programming Procedure
Power On or Reset the System
The initial value of WDT Control Register (D3~D0) is zero (0), when
power is on or the system has been reset. The following table indicates
the initial value of WDT (00000000b )
:
A.1.4 Clear the WDT
WDT counter interval cannot be longer than the preset time, otherwise,
WDT sends a reset signal to the system. The following is an example of
clearing the WDT program in Intel 8086 assembly language.
Table A.2: WDT Control Register Bit Definition
Table A.3: WDT Control Register Initial Value
Bit Value Mean
3 0 Disable Watchdog Timer
2,1,0 000 Select 64 second
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