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TMS320F28052F typical value for external crystal to reach 60MHz system clock frequency

Alexandre BALDINO
Intellectual 540 points

Hi,

I suppose typical value are 5Mhz, 10Mhz, 15Mhz and 20Mhz for external crystal resonator, and I'd like to know if 16MHz is an acceptable value in order to reach 60Mhz system clock?

This gives a ratio of 3.75, how can I configure the microcontroller to get the 60MHz?

Thank you,

Best regards

  • 0
    TI__Guru 57255 points

    Hi Alexandre,

    The PLL has an integer multiplier and then an integer divider in its path before it becomes the chip's main clock (SYSCLK).

    The largest divider value is /4 and the largest multiplier is 18.  This device requires a xtal between 5-20MHz be used.

    ===

    With a 16MHz XTAL, you could use the following to make SYSCLK 60MHz:  (16MHz *15) / 4

    I would also recommend that you make sure that the crystal you wish to use meets the F28052F's crystal requirements.  These specifications can be found in this device's datasheet.

    Hopefully this helps.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Intellectual 540 points
    Hi Brett,
    thank you that's exactly the answer I expected!
    Best regards