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TDA4AH-Q1: MCSPI Ref CLK Frequency

Part Number: TDA4AH-Q1

I have been looking into the available SPICLK frequencies for the MCSPI interface on the TDA4AH. Based on Table 12-36 "MCSPI Controller Clock Rates" of the TRM the SPI CLK has multiple available frequencies based off the settings of the MCSPI_CHCONF register and the SPICLKREF. The table shows a SPIREFCLK frequency of 50MHz. Is this always the frequency of SPIREFCLK or does that frequency get set somewhere else?

Thanks,

Chris