FAQ
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常見問答
如何在程式中修改NuMicro®系列晶片的外部晶振(HXT)的設定值? 日期：2016-05-17
以Nano100B為例，晶片支持的各種clock source定義在”system_Nano100Series.h”檔案中。其所默認使用者所採用的外部晶振是 12 MHz，倘若使用者外部晶振改成 8 MHz，則相對常數定義必須同步更改，請參考底下方式修改粗體字部分。
修改前:
…
/*-----------------------------------------------------------
Define SYSCLK
*---------------------------------------------------------*/
#define __HXT (12000000UL)
#define __LXT (32768UL)
#define __HIRC12M (12000000UL)
#define __LIRC (10000UL)
#define __HIRC __HIRC12M
#define __HSI (__HIRC12M) /* Factory Default is internal 12MHz */
…
=============================================================
修改後：
…
/*-----------------------------------------------------------
Define SYSCLK
*---------------------------------------------------------*/
#define __HXT (8000000UL)
#define __LXT (32768UL)
#define __HIRC12M (12000000UL)
#define __LIRC (10000UL)
#define __HIRC __HIRC12M
#define __HSI (__HIRC12M) /* Factory Default is internal 12MHz */
…
| 產品: | 微控制器 ,Arm Cortex-M0 微控制器 ,Arm Cortex-M4 微控制器 |
|---|---|
| 應用: | |
| 功能: | Peripherals,Clock Control,HXT,Software and Tools,Development-Environment,BSP Software Library |