And if you use not pin 27 to call an interrupt, but another pin that has a higher priority?
Which pin input can have a higher priority?

I didn't understand what I needed to do "Suggest you use a peripheral (RMT or MCPWM, for example) if you need to measure the time precisely"? There is an assumption that the interrupt on pin 27 has a low interrupt priority. And if another interrupt has a higher priority, then the interrupt with a hi...

Hi. I am sending a stable signal with a frequency of 10000 Hz from a quartz oscillator. The variable M must be stable and in the range from M=240013970 - 240013971.But the variable M varies over a larger range. I think other interrupts may have a higher priority and calling my interrupt is waiting f...