// Register: ADCON0
extern volatile unsigned char ADCON0 @ 0x01F;
#ifndef _LIB_BUILD
asm("ADCON0 equ 01Fh");
#endif
// bitfield definitions
typedef union {
struct {
unsigned ADON :1;
unsigned GO_nDONE :1;
unsigned CHS :4;
unsigned ADCS :2;
};
struct {
unsigned :1;
unsigned GO :1;
unsigned CHS0 :1;
unsigned CHS1 :1;
unsigned CHS2 :1;
unsigned CHS3 :1;
unsigned ADCS0 :1;
unsigned ADCS1 :1;
};
struct {
unsigned :1;
unsigned nDONE :1;
};
struct {
unsigned :1;
unsigned GO_DONE :1;
};
} ADCON0bits_t;
extern volatile ADCON0bits_t ADCON0bits @ 0x01F;
这是头文件对ADCON0的定义，第一个结构体中的GO_nDONE和第二个结构体中的GO有什么区别？？？为什么定义三个结构体？
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