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參數(shù)資料
| 型號： | TriCore |
| 廠商： | SIEMENS AG |
| 英文描述： | 32-bit microcontrollers(32位微控制器) |
| 中文描述： | 32位微控制器（32位微控制器） |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 117K |
| 代理商： | TRICORE |
How to use the
Watchdog Timer of the TriCore
11 of 17
AP3219 Rel.02
5
Normally, an embedded application program is built around a loop of routines, which are
repeatedly executed. For example, consider the configuration in the figure shown below.
This illustrates a program which, after reset, carries out whatever initialization is required.
Then it proceeds to a loop of routines that are executed over and over again. Besides this
main loop, there is a set of interrupt service routines (these are not shown in the following
figures).
Within the loop of the mainline program, the Watchdog Timer service sequences are
embedded. Of course, also an initialization of the Watchdog must be made if a different
time-out value than the default one is desired.
The WDT Service should be placed properly in the application such that a safe service
before the next overflow is guaranteed. The service should normally be performed in the
main routine. Placing the service sequence into an interrupt routine could cause that the
WDT Service will be executed even if the main program goes awry. This could disable the
intended monitoring function of the Watchdog Timer.
Using the Watchdog Timer
Figure 1
Standard WDT Service
Return
Return
Return
Return
Service Routine
Subroutines
Subroutines
Service Routine
INT 1
Service Routine
INT 2
Service Routine
INT 3
Subroutines
Init
WDT-6
Reset
INT n
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