Chapter 16
SWRU191C–April 2009– Revised January 2012
Watchdog Timer
The Watchdog Timer (WDT) is intended as a recovery method in situations where the CPU may be
subjected to a software upset. The WDT resets the system when software fails to clear the WDT within
the selected time interval. The watchdog can be used in applications that are subject to electrical noise,
power glitches, electrostatic discharge, etc., or where high reliability is required. If the watchdog function is
not needed in an application, it is possible to configure the Watchdog Timer to be used as an interval timer
that can be used to generate interrupts at selected time intervals.
The features of the Watchdog Timer are as follows:
• Four selectable timer intervals
• Watchdog mode
• Timer mode
• Interrupt request generation in timer mode
The WDT is configured as either a Watchdog Timer or as a timer for general-purpose use. The operation
of the WDT module is controlled by the WDCTL register. The Watchdog Timer consists of a 15-bit counter
clocked by the 32-kHz clock source. Note that the contents of the 15-bit counter are not user-accessible.
The contents of the 15-bit counter are retained during all power modes, and the Watchdog Timer
continues counting when entering active mode again.
Topic ........................................................................................................................... Page
16.1 Watchdog Mode .............................................................................................. 160
16.2 Timer Mode ..................................................................................................... 160
16.3 Watchdog Timer Register ................................................................................. 160
159
SWRU191C–April 2009–Revised January 2012 Watchdog Timer
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