I'm doing a little project, and the AVR in it is running at 3.3V (well, will be that is) and a part of the device wants 5V.
Now, according to the general IO pin schematic, the protection of each pin consists of two diodes connected to Vcc and GND.
I'm thinking to use one resistor, instead of making a voltage divider for the inputs on the AVR. With this I'd abuse the protection diodes. The extra voltage would dissipate on the resistor, and the diode would provide the "reference" to which the voltage is supposed to be trimmed.
So instead of using two resistors to connect the 5V output to the 3.3 input of the AVR, I'd use one resistor.
Is this OK/wise?