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TMS320F28023-Q1: How to test INTOSC1 waveform

Julia Li
Expert 4725 points
Part Number: TMS320F28023-Q1


Tool/software:

Hi Champs,

Now my customer is checking their power sequence and they use INTOSC1 now. Is there any method to output this signal and test this signal via an oscilloscope? Thanks!

Julia

  • 0
    TI__Expert 5040 points

    Hello,

    The clockout option on TMS320F28023-Q1 is the XCLKOUT pin. By default at power-up XCLKOUT = OSCCLK/16, or the INTOSC1/16.
    You can set it to be equivalent to the OSCCLK by configuring the PLLSTS and XCLK registers.

    There are more details in the TRM on how to configure the registers appropriately if you want to propagate INTOSC1 without dividers.

    Regards,

    Susan

  • 0 in reply to Susan Moore
    TI__Expert 4725 points

    Hi Susan,

    Will  XCLKOUT pin output XCLKOUT = OSCCLK/16 waveform after power on reset? My customer tried to test and found this pin as always high after power on and it didn't output the clock.

    Yellow: XCLKOUT

    Green: Xrs

    Could you help to check this? Thanks!

    Julia

  • 0 in reply to Julia Li
    TI__Expert 5040 points

    Hello,

    Did you set the mux control for GPIO18 to XCLKOUT?

    Regards,

    Susan