PPC12-427/Configuration
v1.0
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Page 17
Our optional PPC12-427 VESA mount bracket (KIT-MNT-427-VESA) can be
installed if VESA mounting is required. See Figure 7.
Figure 7.
Back bezel with VESA mount bracket installed
7.3
Watchdog Timer (WDT)
7.3.1 WDT Register Usage
The Watchdog Timer (WDT) implemented in the PPC12-427’s embedded
controller (EC) can be used to reset the system if a lock-up prevents a
software task from periodically resetting the watchdog timer. The WDT is
controlled through a set of virtual registers that are exposed to Apollo
Lake applications by the EC on the PPC12-427. The WDT can be
programmed to count in either seconds or minutes; it has a minimum
granularity of 1 second, and a maximum granularity of 255 minutes.
7.4
Real-time Clock/Calendar
A real-time clock is used as the AT-compatible clock/calendar. It supports a
number of features including periodic and alarm interrupt capabilities. In
addition to the time and date-keeping functions, the system configuration
is kept in CMOS RAM contained within the clock section. A battery must be
enabled for the real-time clock to retain time and date during a power
down.
WINSYSTEMS has software available for manipulating the CMOS RTC from
a high-level application.
