TMS570LC4357 Datasheet, PDF (138/227 Pages) Texas Instruments – Hercules Microcontroller Based on the ARM® Cortex-R Core

TMS570LC4357
SPNS195C – FEBRUARY 2014 – REVISED JUNE 2016
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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.
Down
Counter
100%
Window
50%
Window
25%
Window
12.5%
Window
6.25%
Window
3.125%
Window
WiWndinodwowOOppenn
Window Open
W Open
Op
O
O
WiWndinodwowOOppenn
Window Open
W Open
Op
O
O
0
DWWD Preload
Down Counter
=
Digital
W_Win_iDnd^ido^gow^itwae^led_d
W_Wa_at_tc_ch_h
RESET
INTERRUPT
D_Do_og_{g ESM}
Figure 6-22. Digital Windowed Watchdog Example
138 System Information and Electrical Specifications
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