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Problem in timer interrupt

Other Parts Discussed in Thread: TM4C129ENCPDT

Hello,

     In my industry we are using tiva tm4c129encpdt controller. Crystal used 25MHz. Controller speed 120MHz  I have configured the timer with 1000 mSec value. then i found that it is generating interrupt after 500 mSec  then i again adjusted value in timer configuration and double its speed.  Then it works fine for 1000msec time interval. After few days again i compiled my code and write it into controller. I found that it is giving interrupt. after 2000mSec then i again changed the timer configuration value.

     Every time i am facing this timmer problem in my tm4c129 controller.