Hi eveyone, I am taking a course about microcontrollers and 8051 family and now I am so confused about the external interrupts. Therefore, I have some questions to ask. First of all, as I know we need to remove the low level situation before the RETI instruction is executed. But how can we do this in assembly? Can anyone put some sort of code to make it clear? Second one, how does edge-triggered interrupt work? These are the basic questions that I want to learn. However, further information about the external interrupts are welcome.