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关于PL455的寄存器问题



本人在设置PL455寄存器TSTCONFIG 0x1E–1F (30–31)  遇到一个问题,0X1E的高四位,无论我写什么数据进去,读出来的都是0.

低四位写数据就可以读出来,或者换成其他的可读写的寄存器,写进去都可以读出来,究竟是什么原因呢?谢谢