STM32时钟学习笔记(2010-01-27 09:23:15)转载标签：杂谈 分类：嵌入式

在STM32中，有五个时钟源，为HSI、HSE、LSI、LSE、PLL。

①、HSI是高速内部时钟 8M，RC振荡器，频率为8MHz。

②、HSE是高速外部时钟，可接石英/陶瓷谐振器，或者接

外部时钟源，频率范围为4MHz~16MHz。

③、LSI是低速内部时钟，RC振荡器，频率为40kHz。

④、LSE是低速外部时钟，接频率为32.768kHz的石英晶体。

⑤、PLL为锁相环倍频输出，其时钟输入源可选择为HSI/2、

HSE或者HSE/2。倍频可选择为2~16倍，但是其输出频率最

大不得超过72MHz。

-STM32 Clock study notes (2010-01-27 09:23:15) reproduced Tags: Zatan Category: Embedded in the STM32, five of the clock source for the HSI, HSE, LSI, LSE, PLL. ①, HSI is a high-speed internal clock 8M, RC oscillator frequency is 8MHz. ②, HSE is a high-speed external clock, which can be accessed quartz/ceramic resonator or external clock source connected, the frequency range of 4MHz ~ 16MHz. ③, LSI is the low-speed internal clock, RC oscillator, a frequency of 40kHz. ④, LSE is a low-speed external clock, then a frequency of 32.768kHz quartz crystal. ⑤, PLL output frequency for the PLL, the clock input source option for the HSI/2, HSE or HSE/2. Selectable frequency of 2 to 16 times, but its maximum output frequency must not exceed 72MHz.