An electronic apparatus with a USB connection has a functional circuit with a processor, a parallel address data bus couple to the processor and a USB device controller circuit with a USB interface in parallel with said address/data bus. The apparatus contains an interface integrated circuit electronically between the USB connection on one hand and the parallel address/data interface and the USB interface on the other hand. The interface integrated circuit has external terminals for connecting to a USB bus, a transceiver capable of transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface. The USB interface is coupled to the USB connection. The device interface is connected to the external USB device controller circuit. A host controller is coupled to the host interface, the host controller being coupled to the functional circuits via the parallel data/address bus.