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MSP430数字IO功能选择中,主外设模块功能和第二外设模块功能有什么区别?



在《MSP430x2xx 系列 用户指南》,数字IO---->8.2.5 功能选择寄存器PxSEL 和PxSEL2 中,如下图

我想问一下,MSP430里哪些外设属于主外设,哪些外设属于第二外设?