techie
Advanced Member level 3
Is it OK to provide a slow signal on the interrupt pin of an 8051 derivative. I have an application where I have provide the signal to an 89C51 from a mechanical limit switch. I have used capacitors to chack debounce but the slope is now slow (it takes about 100us from high to low). I can't use a schmitt trigger or even a buffer to speed it up since the PCB is already designed and I cant make any changes now. I want to know if the interrupt will still work correctly with a slow edge signal