I2S MCLK pin as input for refrence clock?

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I2S MCLK pin as input for refrence clock?

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jc
Contributor II
Can pins with MCLK function (PIO0_5,PIO0_23,PIO1_31)  be used as input for Flexcomm (with I2S) reference clock ?
Can I connect external clock to this pins?
Information in user manual are imprecise.
I only found:
Imclk1.png

mclk2.png

How to configure for example pin PIO0_23 as input with MCLK function?
In IOCON register for this pin I can set function MCLK but there no option for direction.

Or I'm wrong and MCLK might just be only output.

Regards
JarekC

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xiangjun_rong
NXP TechSupport
NXP TechSupport

Hi, Jaroslaw,

I suppose that you use LPC55S69, if it is the case, pls refer to the section 4.5.6 in the UM11126.pdf. In other words, the MCLK control register controls the MCLK pin direction, in other words, the pin MCLK can be input or output, the MCLKIO determines the direction.

Hope it can help you

BR

Xiangjun Rong

pastedImage_1.png

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