Using the left ATMEGA328P-PU controller in an Arduino UNO board

Question

Arduino

Hello!
I took an Arduino UNO board with an ATMEGA 328P-PU controller, bought an ATMEGA 328P-PU controller separately (a microcircuit with 28 pins) and replaced the native controller on the arduino board with a new-left controller. I tried to load a program into the new controller that blinked beautifully with the LED on the native controller, but it didn’t work out there. I got an error loading the program, and then I realized that it was impossible to load programs into the new controller in this way.

Please tell me why I didn’t manage to download programs through the arduino board to the left controller, and how to deal with it.

Thank you.

Answer 1

Take a programmer (AVR ISP, USBtinyISP or the Arduino itself with an ISP sketch), connect a new crystal to it and sew a bootloader into it that can “receive” programs from the IDE.
In the IDE menu Tools -> Burn Bootloader

Answer 2

You need to flash the Arduino bootloader into the controller.