Why is there a delay in triggering ISR when HRPWM-period is enabled in ePWM block?

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MathWorks Support Team 2015-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/177959-why-is-there-a-delay-in-triggering-isr-when-hrpwm-period-is-enabled-in-epwm-block

回答： MathWorks Support Team 2015-2-12

Why the Interrupt Service Routine (ISR) invoking is delayed when the "HRPWM Period enable* *(HRPWM-period)" is enabled in the ePWM Block?

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Answer 1

MathWorks Support Team 2015-2-27

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The reason for the delay is the Scale Factor Optimizing (SFO) library used. When the option "HRPWM Period enable* *(HRPWM-period)" is enabled, the Micro Edge Positioner (MEP) values are recalculated at each step causing the delay. This information can be found at the following page.
<http://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/c280xc2802xc2803xc2805xc2806xc28x3xc2834xf28m3xepwm.html http://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/c280xc2802xc2803xc2805xc2806xc28x3xc2834xf28m3xepwm.html
>
In order to overcome this issue please follow the below mentioned steps.
1. Disable "HRPWM Period enable (HRPWM-period)"
2. Enable "HRPWM Period enable (HRPWM-duty)"
3. Disable "Use scale factor optimizer (SFO) software"
4. Disable "Enable auto convert"