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1. 三线I2Smode指的是不需要MCLK， 使用 内部晶振做时钟参考源。不用的话，MCLK和BCLK短接。但大多数情况下还是建议使用外部MCLK 作为参考。
2. 不需要专门配置，内部Digital Audio Processor会自动检测并进行配置 ：
The DAP can autodetect and set the internal clock control logic to the appropriate settings for all supported clock
rates as defined in the Clock Control Register
