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Hi, i wanna know how to make an external interrupt from falling edge to rising edge, the example on the keil site only works with falling edge.. how can i do that ?
if it be a normal 8051 core you not be ablle to!!
1 - level trigger 2 - edge trigger (fallinging edge)
what i be done think is put output of external xor gate to interruppt, the input too one input of xor and and port pin to other
then you be change port pin to innnvert the inputt and therefour change edge you detecting
simple yes!!??
here circuit i desccribeded:
| CPU IP---|--| | | |---|Interrrupt pin +-|--| | | | +--------|Port pin | |