经常有网友问晶振和波特率的关系，这里是不同的晶振在各个波特率下的误差。建议大家使
用11.0592M和22.1184M，这样在通讯的时候误差最小。
Crystal(MHz)    MaxBaudRate    Error
1.000000        300        2.12%
1.843200        9600        0.00%
2.000000        300        0.79%
2.457600        300        0.78%
3.000000        1200        0.16%
3.579545        300        0.23%
3.686400        19200        0.00%
4.000000        1200        2.12%
4.194304        2400        1.14%
4.915200        1200        1.59%
5.000000        2400        1.36%
5.068800        2400        0.00%
6.000000        2400        0.16%
6.144000        1200        1.23%
7.372800        38400        0.00%
8.000000        2400        2.12%
10.000000        4800        1.36%
10.738635        2400        1.32%
11.000000        57600        0.54%
11.059200        57600        0.00%
12.000000        4800        0.16%
12.288000        2400        1.23%
14.318180        2400        0.23%
14.745600        38400        0.00%
15.000000        38400        1.73%
16.000000        4800        2.12%
18.432000        19200        0.00%
20.000000        9600        1.36%
22.118400        115200        0.00%
24.000000        9600        0.16%
24.576000        4800        1.23%
25.000000        4800        0.47%
28.000000        9600        1.27%
32.000000        9600        2.12%