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SCI烧写程序问题

我用的是片子是28377s,想用串口加载程序。按照手册上讲的,先给芯片发送字符“A” ,待芯片能够正确返回字符A的时候标示,芯片锁定了比特率,手册上将如果接下来第二个字如果不是0x08AA,芯片将从flash启动。可是我发的第二个字就是0x08AA  芯片却从flash启动了并返回AA(16进制的AA)。这是什么原因呢?