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看数据手册，MSP430FR2433的eUSCI_A0、eUSCI_A1、eUSCI_B0都是可以用作SPI的，但是官网介绍外设资源时标明串口外设是1个IIC，2个SPI，2个UART，为什么不是3个SPI，是哪两个不能同时用吗？
