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请教MSP430F2481的BSL修改波特率的问题

Other Parts Discussed in Thread: MSP430F2481

各位大侠,我自己做了个设备来给MSP430F2481通过BSL升级程序(JTAG熔丝已经被烧断了),现在能复位MCU进入BSL,也能擦除并写入程序,就是那个默认的9600波特率实在太慢了点,看手册说是能提速到38400,我发送CHANGE BAUDRATE命令下去,总是返回DATA_NAK,命令如下:
        80 20 04 04 80 8C 02 00 CRC1 CRC2
不知道是不是命令的参数D1 D2 D3设置的不对?请哪位做过的大侠帮助一下,不胜感激!