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EK-TM4C1294XL: Problem regarding the external oscillator setting of the RTC function

Muneto Maeda
Prodigy 110 points
Part Number: EK-TM4C1294XL

Tool/software:

I am using the EK-TM4C1294XL and verifying the RTC function with the sample program "hibernate_calendar" from TivaWare_C_Series-2.2.0.295. When I wrote the program as is, it worked correctly.However, when I changed the code to use the external oscillator XOSC0 by writing MAP_HibernateClockConfig(HIBERNATE_OSC_DISABLE); the program stops running.Are there any other steps or procedures to properly use the external oscillator?

  • +1
    TI__Guru**** 190846 points
    Muneto Maeda said:
    I changed the code to use the external oscillator XOSC0 by writing MAP_HibernateClockConfig(HIBERNATE_OSC_DISABLE); the program stops running.

    Hi,

      How did you supply an external OSC to the device? Can you make sure it is a square wave signal? If you are using the external oscillator, you need to leave the XOSC1 unconnected. Please also make sure on the HIBCTL register the OSCBYP bit is set to high.