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C5000的I/O空间和程序/数据空间是分开的，只能用来访问DSP的片上外设的寄存器。
我有一个问题，I/O空间的寄存器和memory mapped register有何区别。
呵呵，最近在学，想知道。。。。
I/O空间的寄存器映射到内部i/o空间, MMR寄存器在片上RAM
访问外设寄存器, 需要用ioport关键字定义, 而MMR则不需要
