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msp430 红外功能

大家好。我最近在调串口红外,发现一个问题, 红外需要38K的载波,但是msp430并没有调制到38k的载波上,实际波形频率受设置的波特率影响。另外手册上,给的描述是,一个串口数据 低电平 bit 调制后是一个脉冲,高电平bit不调。那么是否调制频率和波特率直接挂钩。?????