FCLK为CPU核供给时钟信号，1/Fclk即为cpu时钟周期HCLK为AHB bus peripherals供给时钟信号，AHB为advanced high-performance busPCLK为APB bus peripherals供给时钟信号，APB为advanced peripherals bus
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FCLK为CPU核供给时钟信号，1/Fclk即为cpu时钟周期HCLK为AHB bus peripherals供给时钟信号，AHB为advanced high-performance busPCLK为APB bus peripherals供给时钟信号，APB为advanced peripherals bus
