On the M5Stack Unit PoE-P4 it goes on the Grove port next to a status display (through a Grove hub) and is found by itself: "Auto" looks on the display's bus too. On other boards it is four wires: 5V, GND, SDA and SCL. Its pull-ups go to its own 3.3 V, so 5V on VCC is safe for the ESP32-P4.
Run on the Unit PoE-P4 beside a Unit OLED. Two things kept it from being found before 0.61.0, both fixed: its BM8563 reads one bit of the timer register differently from the NXP PCF8563, and a new one holds no valid time until the device first sets it. On older firmware, pick "PCF8563" under Settings → System → Clock, choose "own pins" and name the display's two pins.
