SpenceKonde
commented
2 years ago You can use any USB-TTL serial adapter to communicate with the device. I like the cheap CH340G adapters, though my favorite commercially made one isn't readily available anymore, and my version in mass production is months away. So just get some cheapo USB-serial adapter, and be sure to get one that breaks out either DTR or RTS for autoreset. If you don't want it for this, you'll want it in the future.
Not sure which caps on which diagram you're talking about, but all digital ICs, including AVRs like these, require a capacitor betweem n the positive supply pin and ground, one for each pair of such pins, located as close to the chip as possible, 0.1uF (100nf) is typical value specified by the datasheet. If that's the capacitors you're referring to, yes, they are required for reliable functioning of the chip and without them it may reset, hang, or execute instructions incorrectly seemingly at random.
Hi, I need some help. My question is simply how to display data from atmega 4809. Can we use Arduino Uno or nano for this purpose by using their Rx and Tx pins? Do you recommend any other module for the purpose? I am using JTAG2UPDI for programming which is working well but I am not able to communicate it. What is the role of 100nf capacitors between Vin and ground? Do we need to use the exact values of these capacitors to drive the serial communication? Thank you very much.