I'm making very small board for a mega88 - tqfp32 and I'm not able to expose on the dedicated pin-header as many pins as I would like to. So I'm inclined to connect/combine some together, for example PD1 (TXD/PCINT17), PC4(ADC4/SDA/PCINT12), so either I will use UART or I2C, and make sure the other one will be high-z disabled. Except making sure that I do not enable both of these at the same time, is there something else that could be seen wrong/bad? This is for low volume personal board (nothing commercial, no noise, no abuse, no expectation to work 24/7 and not expecting to last long either). Thanks in advance for any opinions.