To measure the response time of the Counter_ReadCapture() API, you can toggle a digital output pin before and after the API is used. You can then use an oscilloscope to measure the time in between.
"In the case of high-speed counting, the count value may shift infrequently" , Can you tell what count values you are getting at the output.
Since this thread has not been responded for long time, this has been locked at this time due to tracking issue appropriately.
It would be appreciated if you post the new thread for further discussion.
Thank you very much for your comprehension for this.