單片機中的位域操作

//定義聯合體，同時命名別名為function

typedef union
{
u8 flagByte;
struct
{
u8 b0:1;
u8 b1:1;
u8 b2:1;
}bits;

}function;
function myflag;//定義聯合體變量myflag

//變量操作

union _SYS_STATUS_
{
struct
{
unsignedm0: 1;

unsignedm1: 1;

unsignedm2: 1;

unsignedm3: 1;

unsignedm4: 1;

unsignedm5: 1;

unsignedm6: 1;

unsignedm7: 1;

unsignedi0: 1;

unsignedi1: 1;

unsignedi2: 1;

unsignedi3: 1;

unsignedi4: 1;

unsignedi5: 1;
unsignedi6: 1;

unsignedi7: 1;

};
struct
{
unsigned intsysStuAll;
};
}
externunion _SYS_STATUS_ sSysStatus;

void tempp()
{
myflag.flagByte=0;
myflag.flagByte=0xff;
myflag.bits.b0=0;
myflag.bits.b1=0;
}