I want to make a digital clock project, but with my own PCB design. My question is, if I use a DS3231 IC, will it know already what to do, or I have upload something in order to make the AtMega32U4 operate with it?

You do not need to upload anything to the RTC apart from setting the correct time

Using DS3231 RTC IC in projects

UKHeliBob October 31, 2021, 10:27pm 2

Yes

Topic		Replies	Views
DS3231 RTC help General Guidance	4	913	May 5, 2021
DS3231 Deutsch	20	15316	May 6, 2021
DS3231 Problem Deutsch	3	1079	May 6, 2021
interfacing i2C DS3231 RTC with IIC / I2C 2004 204 20 x 4 Character LCD Display Displays	4	4365	May 6, 2021
set time an date General Guidance	3	722	May 5, 2021