STM32L0 復位和時鐘控制 Reset and clock control (RCC)

時鐘源： HSE:外部時鐘 HSI16：可以直接用於系統時鐘或者作爲PLL輸入。一般是1%精度 HSI48：The HSI48 clock signal is generated from an internal 48 MHz RC oscillator and can be used directly for USB and for random number generator (RNG) M

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