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F28335的SPI

我现在在用一款SPI接口的DA,该DA20位,数据格式是每次传24位数据,传送格式如下:

时序如下:

请问F28335的SPI一次只能传送16位,而这个要穿送24位,请问有什么思路可以实现??

下面是DA的一段描述,也没怎么看懂。。