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在datasheet（V1.4版本）中关于SPIS的描述过于简单，并且感觉datasheet的描述是错误的。spis_intf寄存器，竟然起始地址是0？？？十分不理解。有大哥指点一下？
5.9.1 SPI Slave Control spis_intf Base address: (+0h)