STC89C51 串口通信波特率设置
//9600
T2L = 0xE0; //设定定时初值
T2H = 0xFE; //设定定时初值
//115200
T2L = 0xE8; //设定定时初值
T2H = 0xFF; //设定定时初值`
//9600
T2L = 0xE0; //设定定时初值
T2H = 0xFE; //设定定时初值
//115200
T2L = 0xE8; //设定定时初值
T2H = 0xFF; //设定定时初值`
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