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TMS320F28027 50Hz Reset

Nathan Szanto
Prodigy 20 points
Other Parts Discussed in Thread: TMS320F28027

I am currently having a problem with the TMS320F28027. After giving it power and connecting it to JTAG, I was unable to establish communication in CCS, receiving a number of errors. Upon further investigation, it was discovered that the MCU is being reset at a rate of 50Hz. Does anyone have any idea what might be causing this?

  • 0
    Guru 13185 points

    Hello,

    Were you able to communicate (debug) with CCS before this happened?

    And what do you mean receiving a number of errors? While compile/build or when you enter the debugging process?

    What kind of errors?

    Best regards,

    Maria

  • 0 in reply to Maria Todorova
    TI__Guru 61235 points

    The resets are most likely from the watchdog timer.  At reset, the watchdog runs off the internal 10 MHz oscillator.  Default timeout period is 13.11 ms, which translates to 76 Hz.  You said you are seeing 50 Hz.  Please double check using a scope to measure the frequency of the XRSn pin pulses.

    Is this your own board design, or a TI EVM?  It sounds like you simply have a JTAG connection issue.  Could be a hardware problem, and emulator problem, or a software (debugger) problem.  If possible, yry another board, a different emulator, a TI EVM, etc. to isolate the problem.

    Regards,

    David