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PTB18 strange behaviour

Question asked by Kubiznak on Jun 25, 2013
Latest reply on Feb 19, 2014 by Bill Pringlemeir

Hi,

when debugging SAI audio on Vybrid (PVF61GS151CMK50 1N02G), we encountered problem with PTB18 behaviour. When IOMUXC_PTB18 MUX set to 0x02 (master clock), it does not output clock.

 

In GPIO mode (MUX 0x00) does not work properly in CMOS mode (ODE 0), works only as open-drain (ODE 1).

 

Tested on two MCUs with the same result.

 

Is this a known issue? Is there any workaround to make audio working on TWR?

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