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[Q] clock after power-up (TM4C123GH6PM)


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Exactly, PIOSC is the default clock....also if other clock source is configured like MOSC, but later on there is a system clock error...then the system clock falls back to PIOSC by default.

 

I would recomend you to check the Data sheet, look for chapter 5...in particular look figure 5.5 it is a functional diagram of the main clock tree.

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