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FSK_D[0:2]/FSK_DV用在FSK PIN mode和FSK I2S mode,如果使用SPI或者Fast SPI模式的话,可以将FSK_D[0:2]/FSK_DV悬空。通过配置register 34的[bit 1:0] FSK_MODE_SEL0来选择四种模式中的一种。