About STM32 tick-tick-EEWORLD

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void SysTick_Configuration(void)

{

            if (SysTick_Config((SystemCoreClock) / 10))    //     1/10s=100ms
            {

                    while (1);
            }

NVIC_SetPriority(SysTick_IRQn, 0x0);
}

The parameter of the SysTick_Config(SystemFrequency / 10) function is the value of the systick reload timer.
The systck count frequency is 72000000 times per second, so 7200000 times is 1/10 second, which is 100ms.

SysTick is a 24-bit down counter. By setting the SysTick control and status register, you can select HCLK clock (72M) or HCLK divided by 8 (9M, the default) as the clock source of SysTick. The
reload register of SysTick determines the timer frequency.

If the clock source of SysTick is 72M, SystemFrequency = 72000000Hz
, then SysTick_Config(SystemFrequency / 1000); is 1ms time base.
// 1/1000 s=1ms

Keywords：STM32 Reference address：About STM32 tick-tick

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