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我用F280049控制一个辅助芯片(SPI从机),该辅助芯片要求每写入一个word都将SPI_CS信号(对应F280049的SPI_STE信号)拉高,以使写入的数据生效。那么,有什么办法可以让SPI在FIFO模式下每输出一个word都将SPI_STE拉高呢?