Watch Dog Timer

The ZY includes support for the watch dog timer included with the Advantech AMD 5x86 SBC. This timer is enabled by software and must be refreshed before it runs out, which is about every 15 seconds. If the ZY software locks up, the watch dog timer will not be refreshed. When the timer runs out, it will induce a cold boot on the SBC. Refreshes are performed automatically by the ZY's Monitor() routine, called every time through the main loop (see figure 2.4). Any command that may take some time to execute (such as DAT or SEQ) also refreshes the watch dog timer on its own.