需要用到引脚第1第2外设功能，看了用户手册《MSP430x5xx and MSP430x6xx Family User's Guide》，没有找到对应的PxSEL0和PxSEL1的引脚功能对应关系。
而且我看了msp430f67791.h文件中，P1，P2，P5，P6是有SEL0和SLE1的，其他几个只有SEL0，这又是为什么？
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