TIMx is composed of a 16-bit counter, a prescaler, and an automatic load register.
Counter: 16 bits (0-65535)
Prescaler 16 bits (register controlled counter)
When the pre-scaling frequency is 1, the counter increases by 1 for each time pulse, and when the pre-scaling frequency is 2, the counter increases by 1 for every two time pulses.
Auto-load register: The count value set by auto-load on each overflow event.
In-depth analysis:
The range of the counter (0-65535)
Prescaler range (0-65535)
Since the maximum frequency supported by STM32F103 is 72Mhz, you should pay attention to the difference between the two when setting. Generally, the automatic reload counter is set larger. If you set it to 10000-1 and set the prescaler to 72-1, you can achieve 1s timing. It can be understood that the counter is increased by 1 every 72 clock pulses, and the timer generates an overflow event when the counter is increased to 10000-1.
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