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AN0158_AT32F423_CRM_Start_Guide
本应用入门指南主要介绍两部分内容：1、基于雅特力提供的 V2.x.x 的板级支持包来进行时钟源码的配置及修改2、如何使用配套的时钟配置工具来进行时钟路径及参数的设定，生成相应的时钟流程代码并使用。
目录
简介 .......................................................................................................................... 6
2 时钟树 .................................................................................................................... 7
3 代码配置解析 .......................................................................................................... 8
3.1 函数接口 .............................................................................................................. 8
3.2 时钟配置流程 ....................................................................................................... 9
3.2.1 复位（CRM Reset） ........................................................................................... 9
3.2.2 Flash 等待周期（Set Flash Wait Cycle） .............................................................. 9
3.2.3 时钟源配置（Clock Source Configuration） .......................................................... 9
3.2.4 PLL 配置（PLL Configuration）........................................................................... 10
3.2.5 总线分频（Set Bus Frequency Division） ............................................................ 11
3.2.6 切换系统时钟（Switch System Clock）................................................................ 11
3.2.7 更新核心频率（Update Core Frequency） .......................................................... 12
3.3 时钟配置示例 ...................................................................................................... 12
4 时钟工具 ............................................................................................................... 14
4.1 环境要求 ............................................................................................................ 14
4.2 安装 ................................................................................................................... 14
4.3 功能介绍 ............................................................................................................ 14
4.4 菜单栏 ............................................................................................................... 15
4.5 新建配置项目 ..................................................................................................... 15
4.6 配置界面的使用 .................................................................................................. 16
4.7 生成代码 ............................................................................................................ 18
5 注意事项 ............................................................................................................... 19
5.1 外部时钟源(HEXT)修改 ........................................................................................ 19
5.2 工具使用 ............................................................................................................ 19
6 案例 系统时钟切换 ................................................................................................. 20
6.1 功能简介 ............................................................................................................ 20
6.2 资源准备 ............................................................................................................ 20
6.3 软件设计 ............................................................................................................ 20
6.4 实验效果 ............................................................................................................ 22
7 案例 时钟失效检测 ................................................................................................. 23
7.1 功能简介 ............................................................................................................ 23
7.2 资源准备 ............................................................................................................ 23
7.3 软件设计 ............................................................................................................ 23
7.4 实验效果 ............................................................................................................ 25
8 案例 PLL 参数计算 ................................................................................................. 26
8.1 功能简介 ............................................................................................................ 26
8.2 资源准备 ............................................................................................................ 26
8.3 软件设计 ............................................................................................................ 26
8.4 实验效果 ............................................................................................................ 27
9 文档版本历史 ......................................................................................................... 28
AN0158_AT32F423_CRM_Start_Guide_ZH_V2.0.0.pdf
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