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TMS320F28069: HRCAP period measurement

Part Number: TMS320F28069

Hello,

I am using HRCAP to measure frequency. But the measurement is less accurate than using ECAP. For example ECAP measured 200 kHz but HRCAP measured 199 kHz. Does anybody know what could be the problem such as I need to input some calibration parameter?

Thank you.

Best regards,

Kim Ean