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对于上面GPIO引脚复用表，我想把GPIO19复用到X1，但是，X1对于的列头时ALT，不知道ALT是上面意思，使用不知道咋复用？
你好，请参考以下对于ALT功能的描述：
请参考：TMS320F28003x 实时微控制器 数据表 (Rev. A)5.4.1节
TMS320F28003x Real-Time Microcontrollers TRM (Rev. A)(英文內容) 表3-6
