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I would recommend one with a MSSP port (hardware I2C) otherwise a I2C slave is very hard to implement.
Another point is that the slave pulls SCL low while it is processing your request so your master code must wait until SCL is released from the slave before transmitting the next command or databyte.
This is very important and must be implemented in your master code ...
If you just need some simple communication use an asynchronous serial connection which is very easy to implement.
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