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CPU Latency for End_of_Task ISR

Lucas Sinopoli
Intellectual 671 points

Hello,

   I am using the CLA to trigger an ISR at the End of Task. The ISR works correctly and it is actually triggered by the end of task as I configured it. The problem is that the time that it takes for the ISR to actually get executed is too long (900ns approx.) 

   I am using a 28035 and meassuring the times by software forcing a PWM output.

   Next is a basic timing diagram to illustrate my point.


CLA: ___|   CLA Task 1 |_____________________

CPU: _______________________________| CLA Task1 End of task ISR |_________________

                                    <----- 900ns -------->

  

  Could anyone assist me on how to reduce this latency time? Unfortunately, 900ns completely exceeds the time allowance of my application making the CLA ISR useless to me.

  Thanks in advance,

Lucas