The NRST pin of the STM32F103C8T6 has a system reset duration of 20us, why use 10K and 104 capacitors (RC=1ms)?

STM32 has internal reset circuit, can not be external RC.

But some people on the Internet, maintain the single-chip microcomputer thinking, plus external RC; There are also some people in order to prolong the circuit reset time, add an external RC for reset.

So you can see different reset circuits on the Internet.