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TM4C1294NCPDT Maximum Operating Frequency from PIOSC

Daniel Greenheck
Prodigy 130 points
Other Parts Discussed in Thread: TM4C1294NCPDT

I looked through the datasheet but was unable to find a solid answer.

I am using the 16 MHz PIOSC on the TM4C1294NCPDT. I originally had a 25 MHz crystal to run at 120 MHz, but missed the RBIAS errata so am forced to use the internal oscillator.

  1. The VCO must be configured to 320 MHz when using PIOSC, correct?
  2. The maximum operating frequency must be a divisor of VCO. I have it configured at 80 MHz but can it run at 160 MHz?

Thanks,

Dan

  • 0
    TI__Guru**** 244400 points
    Hello Daniel,

    No the VCO can be configured to either 320 or 480MHz irrespective of the source. This depends on the how the SysCtlClockFreqSet parameters are called.

    The system clock however has to be an integer divider of the VCO. The TM4C129x devices are spec'ed for maximum of 120MHz.

    Also do note that when not using the external crystal, the OSC0 pin must be tied to GND.

    Regards
    Amit