If we go in the direction of rapid development like Arduino, we will definitely use those processors Atmega328P and Atmega32U4. Here, the latter provides native full-speed USB2.0 support compared to the former.
If you look at the Atmega series before 328P, there are Atmega8, Atmega48, Atmega88, Atmega168, Atmega162, AtmegaA8U2, etc.
There are 5 groups of interfaces designed, namely:
The interface of CH340G includes RTS and DTR download circuits, which are used to automatically reset some chips.
USB interface, connected to CH340G
DC input interface, maximum 9V
All pins of Atmega8
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