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SysTick
- STM32官方例程，滴答时钟，可利用系统内的滴答进行延时，更加准确-This example shows how to configure the SysTick to generate a time base equal to 1 ms. The system clock is set to 24 MHz on Value line devices and to 72 MHz on other devices, the SysTick is clocked by the AHB cl