What project are you trying to replicate? Perhaps they have a reason for switching the pin rapidly between LOW and 'high impedance' (basically disconnected). That's a way of emulating an Open Collector/Open Drain output.
What project are you trying to replicate? Perhaps they have a reason for switching the pin rapidly between LOW and 'high impedance' (basically disconnected). That's a way of emulating an Open Collector/Open Drain output.