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What's the role of CPOL in I2S?

Question asked by waclawek.jan on Sep 27, 2017
Latest reply on Jan 3, 2018 by waclawek.jan

Clocks in the I2S diagrams in STM32F4xx DS show two settings of CPOL, although the difference appears to be minor:

 

Also caption of several figures in I2S portion of the SPI/I2S chapter in RM0090 contain CPOL=0.

However, the text in the same I2S portion of the SPI/I2S chapter contains no mention of CPOL; and the description in the registers section is aptly titled 28.5.1  SPI control register 1 (SPI_CR1) (not used in I2S mode) and repeats "It is not used in I 2 S mode and SPI TI mode." as a note at the CPOL bit description itself, too.

 

Comment, please.

 

Thanks,

 

Jan Waclawek

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