Datasheet

RESET
Down
Counter
Down CounterDown Counter
DWWD PreloadDWWD Preload
=
0
Digital
Windowed
Watch
Dog
Digital
Windowed
Watch
Dog
100%
Window
Window OpenWindow Open Window OpenWindow Open
50%
Window
25%
Window
12.5%
Window
6.25%
Window
3.125%
Window
INTERRUPT
ESM
Digital
Windowed
Watch
Dog
Window Open Window Open
Window Open Window Open
W Open W Open
Op Op
O O
O O
136
RM57L843
SPNS215C –FEBRUARY 2014–REVISED JUNE 2016 www.ti.com
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System Information and Electrical Specifications Copyright © 2014–2016, Texas Instruments Incorporated
6.21 Digital Windowed Watchdog
This device includes a Digital Windowed Watchdog (DWWD) module that protects against runaway code
execution (see Figure 6-22).
The DWWD module allows the application to configure the time window within which the DWWD module
expects the application to service the watchdog. A watchdog violation occurs if the application services the
watchdog outside of this window, or fails to service the watchdog at all. The application can choose to
generate a system reset or a nonmaskable interrupt to the CPU in case of a watchdog violation.
The watchdog is disabled by default and must be enabled by the application. Once enabled, the watchdog
can only be disabled upon a system reset.
Figure 6-22. Digital Windowed Watchdog Example