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急!急!急!ADS7864的I/O地址问题

Other Parts Discussed in Thread: ADS7864

ADS7864接DSP5402映射到I/O空间(接口为并行I/O)。ADS7864的的六个寄存器是FIFO寄存器,根据ADS7864手册最后的图32,用端口寻址方式PORTR读取采样数据,是不是每一次读取的数据都是在寄存器0里?这样是不是只需要读I/O端口地址就可以了,而不需要每个寄存器的地址?