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我现在在做的一块板子使用msp430f5438,I/O电压为3.3V,通过UART和外设连接,外设的UART是TTL电平,也是3.3V,请教是否可以直接将msp430f5438的UART和TTL电平的外设直接连接,如果不可以的话,是否有推荐的转换芯片,谢谢。