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TBE -> 发送数据缓存区为空; 0:不空, 1:空
TC -> 发送完成; 0:未完成, 1:完成
RBNE -> 读数据缓存区非空; 0:空, 1:不空
BAUD -> 30d4:19200;61a8:9600
CH1:单片机接收,PC发送
CH2:单片机发送,PC接收