EEPW论坛

之前都是参考别人的电路图来绘制自己的电路图，对于最小系统晶振的选择这一块没有深入的探究过，今天看到一段注解，由此想到了这个问题，特来请教请教：

1. If the system clock source selected by user fails to startup, the SystemInit()function will do nothing and HSI still used as system clock source. User can  add some code to deal with this issue inside the SetSysClock() function.
2. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depedning on the product used), refer to "HSE_VALUE" define in "stm32f10x.h" file. When HSE is used as system clock source, directly or through PLL, and you are using different crystal you have to adapt the HSE value to your own configuration.

这个如何根据产品需要来确定呢？是不是选择和HSI大小一致的效果更好呢？

另外就是晶振的负载电容选取这一块有什么注意事项吗？还望大神们多多指点，在此谢过。