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CCS/TMS320F28035: About HR capture module

Shi Pu
Prodigy 70 points
Part Number: TMS320F28035

Tool/software: Code Composer Studio

I'm trying to use HR capture module in 28035. I have some questions about HR cap. Since it's capturing rise/fall edge in 300 ps level. How much is the triggering voltage level for the capture INT generate? 

Also, can I manual set the voltage level that can trigger the capture INT? For example, I want it to capture the falling edge when the voltage received reaches 0.3V. Thank you

  • 0
    TI__Guru**** 464301 points
    I will movie your post to the C2000 forum. The experts there can help you best.

    Thanks
    ki
  • 0
    TI__Mastermind 42195 points

    Shi,

    This is determined by VIH(rising edges) and VIL(falling edges). The published numbers can be found in the Datasheet (5.4 Recommended Operating Conditions), search for "VIL" and "VIH". These are not adjustable, and vary somewhat from device to device. This is very easy to characterize for a device, simply provide a relatively slow sine wave as the input to the HRCAP, and toggle a GPIO on a capture value.. When you see the GPIO toggle you know you are at VIL or VIH.

    Regards,
    Cody