Advantech AiMC-2000, User Manual

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AiMC-2000 User Manual 40
A.1 Programming the Watchdog Timer
The AIMB-215 B1 watchdog timer can be used to monitor system software opera-
tions and execute corrective actions if the software fails to function within the pro-
grammed period. The operations and procedures for programming the watchdog
timer are described in this section.
A.1.1 Watchdog Timer Overview
The watchdog timer is built into the NCT6106D super I/O controller, and facilitates
the following user-programmable functions:

Can be enabled and disabled via a user program

The timer interval can be set as 1 to 255 seconds or 1 to 255 minutes

Generates an interrupt or reset signal if the software fails to reset the timer
before timeout
A.1.2 Programming the Watchdog Timer
The I/O port base addresses for the watchdog timer are 2E (hex) and 2F (hex),
where 2E (hex) is the address port, and 2F (hex) is the data port. Users must first
assign register addresses by inputting an address value into address port 2E (hex)
before writing/reading data to/from the assigned register through data port 2F (hex).