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怎样读取ADS7864寄存器里的采样数据?

Other Parts Discussed in Thread: ADS7864, TMS320VC5402

我打算用ADS7864的BUSY引脚触发TMS320VC5402的外部中断来读取AD寄存器里的采样数据,请问我需要用5402的哪条汇编指令来读数据?读数据是不是要用到ADS7864寄存器的地址,地址是多少?请问这个地址是不是I/O空间地址,I/O空间是什么意思?