The TPS65981 features an I²C slave port, where a system controller has the ability to write to the I²C slave port. The I²C port has an I²C interrupt that will inform the system controller that a change has happened in the system. This allows the system controller to dynamically budget power and reconfigures a port’s capabilities dependent on current state of the system. The system controller is also used for updating the TPS65981 firmware over I²C, where a connected host or the application processor loads the Firmware update to the system controller and then the system controller updates firmware stored in the SPI Flash memory via I²C writes to the TPS65981. In a dock or monitor application, the video scalar is commonly a processor and the I²C master capable of acting as the system controller for the TPS65981.