有个冒号的那个东西 !!! 谢谢 ！！！！！！！！！！！！
在core_cm3.h里面看见的
typedef union
{
struct
{
uint32_t _reserved0:27; /*!< bit: 0..26 Reserved */
uint32_t Q:1; /*!< bit: 27 Saturation condition flag */
uint32_t V:1; /*!< bit: 28 Overflow condition code flag */
uint32_t C:1; /*!< bit: 29 Carry condition code flag */
uint32_t Z:1; /*!< bit: 30 Zero condition code flag */
uint32_t N:1; /*!< bit: 31 Negative condition code flag */
} b; /*!< Structure used for bit access */
uint32_t w; /*!< Type used for word access */
} APSR_Type;
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