Nexcom DNA 1120 - Appendix A: Watchdog Timer; Watchdog Timer Setting; CRF6 (Default 0 X00)

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DNA 1120/1120A User Manual

Appendix A: Watchdog Timer

aPPendix a: WatChdog timer

Watchdog Timer Setting

DNA 1120/1120A features a watchdog timer that resets the CPU or gener-

ates an interrupt if the processor stops operating for any reason. This feature

ensures system reliability in industrial standalone or unmanned environ-

ments.

CRF6 (Default 0x00)

Watchdog Timer Time-out Value

Writing a non-zero value to this register causes the counter to load the value

to Watchdog Counter and start counting down. If Bit 7 and Bit 6 are set,

any Mouse Interrupt or Keyboard Interrupt event will also cause the reload

of previously-loaded non-zero value to Watchdog Counter and start count-

ing down. Reading this register returns current value in Watchdog Counter

instead of the Watchdog timer time-out value.

Watchdog Timer Time-out Value

BIT Definition

7-0 0x00 time-out disabled

0x01 time-out occurs after 1sec./min.

0x02 time-out occurs after 2 sec./min.

0x03 time-out occurs after 3 sec./min.

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0xFF time-out occurs after 255 sec./min.