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K60: External clock characteristics

Question asked by mike65535 on Nov 5, 2012
Latest reply on Nov 13, 2012 by Pedro Augusto Panecatl Salas

I'm trying to find a spec for the electrical requirements for providing an external clock to the K60.

 

I currently have a circuit that puts a sinewave on "EXTAL", a sinewave that has a DC component of about 0.8V and a pk-to-pk voltage of about 0.7V

 

I get intermittent hanging at this in bsp_cm

 

while ((MCG_S & MCG_S_IREFST_MASK) != 0x00U)  /* Check that the source of the FLL reference clock is the external reference clock. */

{

}

 

 

making me suspicious of the clock.

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