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  • 关于 BCSCTL1 = CALBC1_12MHZ;DCOCTL = CALDCO_12MHZ; 的疑问

     1 /************************************************************
     2 * Calibration Data in Info Mem
     3 ************************************************************/
     4 
     5 #ifndef __DisableCalData
     6 
     7 #define CALDCO_16MHZ_         (0x10F8u)  /* DCOCTL  Calibration Data for 16MHz */
     8 READ_ONLY DEFC( CALDCO_16MHZ     , CALDCO_16MHZ_)
     9 #define CALBC1_16MHZ_         (0x10F9u)  /* BCSCTL1 Calibration Data for 16MHz */
    10 READ_ONLY DEFC( CALBC1_16MHZ     , CALBC1_16MHZ_)
    11 #define CALDCO_12MHZ_         (0x10FAu)  /* DCOCTL  Calibration Data for 12MHz */
    12 READ_ONLY DEFC( CALDCO_12MHZ     , CALDCO_12MHZ_)
    13 #define CALBC1_12MHZ_         (0x10FBu)  /* BCSCTL1 Calibration Data for 12MHz */
    14 READ_ONLY DEFC( CALBC1_12MHZ     , CALBC1_12MHZ_)
    15 #define CALDCO_8MHZ_          (0x10FCu)  /* DCOCTL  Calibration Data for 8MHz */
    16 READ_ONLY DEFC( CALDCO_8MHZ      , CALDCO_8MHZ_)
    17 #define CALBC1_8MHZ_          (0x10FDu)  /* BCSCTL1 Calibration Data for 8MHz */
    18 READ_ONLY DEFC( CALBC1_8MHZ      , CALBC1_8MHZ_)
    19 #define CALDCO_1MHZ_          (0x10FEu)  /* DCOCTL  Calibration Data for 1MHz */
    20 READ_ONLY DEFC( CALDCO_1MHZ      , CALDCO_1MHZ_)
    21 #define CALBC1_1MHZ_          (0x10FFu)  /* BCSCTL1 Calibration Data for 1MHz */
    22 READ_ONLY DEFC( CALBC1_1MHZ      , CALBC1_1MHZ_)
    23 
    24 #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
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  • 原文地址:https://www.cnblogs.com/xiacf88/p/3269689.html
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