Is there a reference as to what functions the 14K50 uC performs? It appears to be used to communicate with the main PIC24 via the UART, so I assume there's a bootloader in the main PIC24 that allows you to download programs?
I assume the Console module works in conjunction with the 14K50 to give you a USB CDC interface. How do you get the 14K50 in and out of "download/programming mode". If using the thing as a "normal serial port", is there anything we should know (ie don't send "xxx" or it'll erase the program)?
It also has a connection to the PIC24 MCLR signal so it can reset it. What controls/generates this?