Voltage of Input Pin with Pull-up Resistor – Atmega8

SimulIDE_1.0.1-R1386_Win32

On a real circuit, the voltage of an input pin with pull-up resistor (DDRx=0 and PORTx=1 in Atmega8) is Vcc (5V). The typical resistance of the pull-up resistor is around 35 KOhm.

I noticed that the voltage, at such a pin, is 0V instead.
The workaround is to add an external resistor (say 35 KOhm) to get 5V on that pin, so that reading PINx returns 1 instead of 0.
It is not a serious bug as long a user is aware of it.

I see...
Internal pullups are implemented but seems that it is only working if there is something connected to the pin.

Fixed at trunk Rev 1433.

The behavior of the internal pull up is identical with or wirhout cannections to the pin. Same in real circuit on a programmed controller.

The behavior of the internal pull up is identical with or wirhout cannections to the pin.

Mcu Pins inside Arduino has connections.
You need to test with a bare Mcu.

Tested on a free pin of this circuit made by me (Without Arduino board) with a ATM328 "a pelo".

Tested on a free pin of this circuit made by me (Without Arduino board) with a ATM328 "a pelo".

Ok but we are talking about a bug in the simulator.