@felmue The M5Stack Cardputer, specifically the Cardputer-Adv version, does not explicitly list an "adv rtc module" in its specifications. However, it is powered by the ESP32-S3FN8 core processor, which includes two built-in RTC timers. One of these has a lower resolution (around 6us) and operates as long as it has power, while the other offers higher resolution (1us) but does not function in sleep modes. It's important to note that neither of these built-in RTC timers retains time across reboots.

Hello.
Does anyone's internal RTC module work?