For testing your code for the Mega 4808 with Arduino you need a board where every pin is accessible. Here is the Mega 4808 minimal board.
Only connect a 1.8V – 5V power supply to VCC and Ground and the board works. It can be programmed over the UPDI Pin.
Here you can read how to start with the Mega 4808 and Arduino.
Other posts about Mega 4808:
You wanna use the Arduino serial (UART) with a Mega 4808 board? No, problem. The Mega 4808 has three serial (UART) interfaces. Here you can read on which pins you can use the serial (UART) interface a…
For testing your code for the Mega 4808 with Arduino you need a board where every pin is accesable.
You wanna programm the Mega 4808 or an other megaAVR 0-series microcontroler? Then you need a UPDI programmer. You can buy the Atmel ICE for ~100$ or you can make your own UPDI Programmer.
You wanna use the Mega 4808 with MegaCoreX and Arduino? Then you need the standard pin usage / pinout for it.