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C2000引脚映射分配问题

SCIRXDA可以映射到GPIO28或GPIO7
SCITXDA可以映射到GPIO29或GPIO12
那我现在如果使用SCI的收发功能的话,硬件管脚有4种组合还是2种组合?可以任意组合吗。 会不会像STM32那样,必须收、发引脚同时映射?