I2S MCLK pin as input for refrence clock?

jc — Fri, 14 Aug 2020 18:54:29 GMT

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:

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

Re: I2S MCLK pin as input for refrence clock?

xiangjun_rong — Mon, 17 Aug 2020 02:27:56 GMT

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

Xiangjun Rong

LPC MicrocontrollersのトピックI2S MCLK pin as input for refrence clock?

I2S MCLK pin as input for refrence clock?

Re: I2S MCLK pin as input for refrence clock?