9.3.1 Starting of Internal Regulator

After power-up, the device is set to its initial state and kept in Reset, until the power has stabilized throughout the device. The default performance level after power-up is PL0. See section on PM – Power Manager for details. The internal regulator provides the internal VDDCORE corresponding to this performance level. Once the external voltage VDDIN and the internal VDDCORE reach a stable value, the internal Reset is released.