关于 BCSCTL1 = CALBC1_12MHZ;DCOCTL = CALDCO_12MHZ; 的疑问

 /************************************************************
 * Calibration Data in Info Mem
 ************************************************************/

 #ifndef __DisableCalData

 #define CALDCO_16MHZ_         (0x10F8u)  /* DCOCTL  Calibration Data for 16MHz */
 READ_ONLY DEFC( CALDCO_16MHZ     , CALDCO_16MHZ_)
 #define CALBC1_16MHZ_         (0x10F9u)  /* BCSCTL1 Calibration Data for 16MHz */
 READ_ONLY DEFC( CALBC1_16MHZ     , CALBC1_16MHZ_)
 #define CALDCO_12MHZ_         (0x10FAu)  /* DCOCTL  Calibration Data for 12MHz */
 READ_ONLY DEFC( CALDCO_12MHZ     , CALDCO_12MHZ_)
 #define CALBC1_12MHZ_         (0x10FBu)  /* BCSCTL1 Calibration Data for 12MHz */
 READ_ONLY DEFC( CALBC1_12MHZ     , CALBC1_12MHZ_)
 #define CALDCO_8MHZ_          (0x10FCu)  /* DCOCTL  Calibration Data for 8MHz */
 READ_ONLY DEFC( CALDCO_8MHZ      , CALDCO_8MHZ_)
 #define CALBC1_8MHZ_          (0x10FDu)  /* BCSCTL1 Calibration Data for 8MHz */
 READ_ONLY DEFC( CALBC1_8MHZ      , CALBC1_8MHZ_)
 #define CALDCO_1MHZ_          (0x10FEu)  /* DCOCTL  Calibration Data for 1MHz */
 READ_ONLY DEFC( CALDCO_1MHZ      , CALDCO_1MHZ_)
 #define CALBC1_1MHZ_          (0x10FFu)  /* BCSCTL1 Calibration Data for 1MHz */
 READ_ONLY DEFC( CALBC1_1MHZ      , CALBC1_1MHZ_)

 #endif /* #ifndef __DisableCalData */

SFR_8BIT(CALDCO_16MHZ);对使用宏定义的地方进行字符展开就是：extern volatile unsigned char CALDCO_16MHZ；
CALBC1_1MHZ and CALDCO_1MHZ are two bytes programmed in the flash at the factory which are a calibrated value as to the VCO (voltage controlled oscillator) 
of the chip.  This means that when you load those two values into the respective registers, you are using a precalibrated setting to get appoximately 1MHz.
CALBC1_1MHZ and CALDCO_1MHZ是用来设置校准值的。TI已经把他放进flash中了。
头文件中有一行字：
/************************************************************
* Calibration Data in Info Mem
************************************************************/
他的意思就是：存储在flash中的校准数据，0x10FFu 这些都是他们的地址