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DEFC( IE2 , IE2_)
DEFW( MPY , MPY_)
这是430单片机头文件里面的一些内容，两个分别是啥意思？DEFC与DEFW在C语言中是用来干什么的？
#define DEFC(name, address) __no_init volatile unsigned char name @ address;
#define DEFW(name, address) __no_init volatile unsigned short name @ address;
主要是对功能寄存器的定义
