LM3S6950 Datasheet, PDF (230/524 Pages) List of Unclassifed Manufacturers – Microcontroller

Watchdog Timer
11
11.1
Watchdog Timer
WDT
A watchdog timer can generate nonmaskable interrupts (NMIs) or a reset when a time-out value is
reached. The watchdog timer is used to regain control when a system has failed due to a software
error or due to the failure of an external device to respond in the expected way.
The Stellaris^® Watchdog Timer module consists of a 32-bit down counter, a programmable load
register, interrupt generation logic, a locking register, and user-enabled stalling.
The Watchdog Timer can be configured to generate an interrupt to the controller on its first time-out,
and to generate a reset signal on its second time-out. Once the Watchdog Timer has been configured,
the lock register can be written to prevent the timer configuration from being inadvertently altered.
Block Diagram
Figure 11-1. WDT Module Block Diagram
Interrupt
System Clock
Control / Clock /
Interrupt
Generation
WDTCTL
WDTICR
WDTRIS
WDTMIS
WDTLOCK
WDTTEST
WDTLOAD
32-Bit Down
Counter
0x00000000
Comparator
WDTVALUE
Identification Registers
WDTPCellID0
WDTPCellID1
WDTPCellID2
WDTPCellID3
WDTPeriphID0 WDTPeriphID4
WDTPeriphID1 WDTPeriphID5
WDTPeriphID2 WDTPeriphID6
WDTPeriphID3 WDTPeriphID7
11.2
Functional Description
The Watchdog Timer module consists of a 32-bit down counter, a programmable load register,
interrupt generation logic, and a locking register. Once the Watchdog Timer has been configured,
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June 14, 2007
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