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标题: 解释一下这个c语言的数据结构 [打印本页]

作者: winnie 时间: 2009-4-18 14:37
标题: 解释一下这个c语言的数据结构
typedef union
{
unsigned char Byte;
struct
{
      unsigned char _RD: 1;
      unsigned char _WR: 1;
      unsigned char _A0: 1;
      unsigned char _MM: 2;
      unsigned char _LCD_E: 1;
      unsigned char _MMM: 2;

}Bit;

}UNION_PORT;

typedef union    //类型定义共用体
{
unsigned char Byte;  // 定义一个字节
struct
{
      unsigned char _RD: 1;       0
      unsigned char _WR: 1;    1
      unsigned char _A0: 1;       2
      unsigned char _MM: 2;    3,4
      unsigned char _LCD_E: 1;  5
      unsigned char _MMM: 2; 6,7

}Bit;  file://定义8位结构体BIT

}UNION_PORT; file://PORT共用体UNION_PORT

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