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Switch between external crystal oscillator and fro on LPC546xx

Question asked by Jerry Cai on Jan 13, 2019
Latest reply on Jan 16, 2019 by ZhangJennie


I have two questions on switching between external crystal osc and internal fro.

MCU: LPC54628

1. In defalut, LPC54628 uses intenal FRO 12M  on reset. if I want to switch to external osc(XTALin) as CLK_IN, what procedure should be followed to promise the stable.  Is there any status we can check the Eternal OSC works well.

2. What will be occured when external crystal osc is failed, does it switch to internal FRO automatically by MCU?