Hi out there?
I would be very happy if anyone can give me an answer or point me in the right direction to find an answer to my question! I have tried google to find it, but without any luck so far :-(
If you use an external crystal oscillator, the output of the "metal can" should be connected to XTAL1 and Gnd, and the correct fusebit to be programmed. Then my question, can the other pin "XTAL2" be used as a general purpose input/output pin?
The reason why I ask is an existing design running internal RC oscillator and using USART. This gives us trouble with the communications, even if the RC oscillator is calibrated. The design uses XTAL2 as an output, and XTAL1 is unused, so I want to modify the board with an external crystal oscillator, just add 3 wires, change fusebits and we are "on the road again"! I could of course just try and se if it works, but I would like to have it documented if it's possible or not.
I have not been able to find anything about this, perhaps one of you know where I can have a look or an answer?
Thanks in advance and best regards