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28027 SPI的SPIFFCT设定非零时STE波形是怎么样的?

我用28027的SPI FIFO功能,试图在每个字之间延时一下,SPIFFCT寄存器貌似提供这个功能:

但我将SPIFFCT后SPI通讯功能就不正常了,怀疑是STE脚的问题,请前辈指教一下?