I am using Arduino ATMega (1280) and I would like to confirm if I am really in trouble… Or there is no way to solve this issue?
I need an interruption pin to wake-up the processor.
I am already using INT0 and INT1 (pins Digital 2 and 3) as interruption pins to wake-up the MCU(working fine).
I am using the I2C bus, so INT3 and INT4 (pins Digital 21-SCL and 20-SDA) cannot be used. There are more than one device on this bus and I do not want (I am afraid of…) to include a hardware line on it to serve as an interruption pin…
Serial1 interface is being used (actually, I am using all 4 serial interfaces). therefore, INT4 (RX1) and INT5 (TX1) cannot be used.