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TMS320VC5416外部程序空间地址收发数据

访问外部程序空间*0x400000,使用示波器测量不能发出数据,网上搜索说需要使用汇编指令对外部程序空间进行读写,请问怎么使用?怎么实现C语言和汇编指令混合完成外部程序空间的访问?谢谢