I am trying to build a shield for a Mega 2560. This shield is designed to Interface dual Hbridge, encoder and limit switches for linear actuators. With the limit switches I have decided to use a MC14490 Hex Contact Bounce Eliminator which requires the use of an oscillator and was hoping to use the internal oscillator via the (ICP3/CLKO/INT7) PE7 (I'm aware of the processes Fuse, Bootloaders, etc..).
Here is the question I can find the (ICP3/CLKO/INT7) PE7 output on the Atmega2560 chip (pin9) but nowhere in the Pinout diagrams for the Arduino Mega 2560 can I find the actual pin to connect to, is there one? I found a reference on another site implying that a wire has to be soldered to the pin9 on the actual chip.
Been trolling the internet but just seem to be going around in circles, hope someone has an answer.
I found a reference on another site implying that a wire has to be soldered to the pin9 on the actual chip.
That's correct. That pin is not broken out to the Arduino headers on the Mega 2560. You'd need to do some precision soldering work with magnet wire. If you're designing the shield PCB you might be better off to just build an entire board with the ATmega2560 on it.
The graphic is from the documentation of this hardware package:
In addition to the standard Arduino Mega pinout shown above, MegaCore also provides another pinout that allows you to use standard Arduino functions with all pins on the ATmega2560. It's a really cool project.