I have taken up the project of converting a 16LF877 project to a 18LF4680
Programming the bootloader works, as does bootloading the program.
For some strange reason the PIC heats up like crazy when port A0 (which I use for AD conversion) is connected to the battery voltage (LiPo, about 4V). When a series resistor is used, AD works normally. The PIC is driven at 5V
I have disabled all secondary functions (Voltage reference and comparators).
Why is port A0 causing this heat up? Shouldn't it be high impedance when defined as AD channel?