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TM4C129ENCZAD: frequency when running PLL

Hiroyuki Kanematu
Expert 2975 points

Part Number: TM4C129ENCZAD

Hello, I want to drive the TM4C129x series as a USB device.

The crystal you are connecting is 16 MHz.
At this time, how many Hz should be set for the PLL oscillation frequency?

Please let me know if there is a frequency value to specify.

  • 0
    TI__Guru*** 135355 points

    Hello Kanematu-san,

    The minimum requirements are PLL running at minimum of 120MHz and system clock running at minimum of 30 MHz. Recommended configuration is 120MHz system clock with 240MHz PLL. This can be achieved with a 16MHZ external oscillator per the clock configuration we previously discussed.

    Best Regards,

    Ralph Jacobi