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您好,在该器件上您只需要配置相应的 P4SEL 位。 同时请注意, UCA0 IO 也会出现在端口 2 上,因此请确保相应的端口 2 PSEL 位不会选择 UCA0 (如果未使用,请将其设置为 GPIO 并将 GPIO 输出设置为低电平):