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TDA4VE-Q1: mcspi 时钟源及时钟配置

Part Number: TDA4VE-Q1

使用 mcspi6 作为主机发送数据, 从机时钟要求是 8M, 软件配置下来,spi clock 实际是8.33M。
请问 mcspi 有没有对应的方法来选择它的时钟源。