Input pull ups

Projects Programming
1

Hello,

Quick question does anyone know if I can use the internal software switchable pull up resistors for the Serial TTL input line?

For example As in I have done Serial.begin already but would now like the RX line of this serial input to be pulled high via the internal resistor ?

Could I use the input pull up command after the serial.begin and it would pull it up and the serial.begin still operate correctly just with less impedance on the RX input.

Thank your for your Time.

2

Which board? According to the 328 datasheet it should be possible (page 90). If it's useful on an Uno is debatable as the TX output of the 16U2 (USB chip) is connected to it and that will keep the pin high.