Patent ID: 6439464
Filing Date: 2002-08-27
Classification: G06K

Abstract:
A dual-mode integrated circuit (IC) for operating in an ISO mode in accordance with International Standards Organization 7816 (ISO 7816) protocol, and a USB mode in accordance with a Universal Serial Bus protocol, the dual-mode IC comprising:a microprocessor; a switching block connected to the microprocessor; an external interface connected to the switching block and comprising a voltage supply pad, a reference voltage pad, a reset pad, a clock pad and an input/output pad in accordance with the ISO 7816 protocol, and a D-plus pad and a D-minus pad in accordance with the USB protocol; and a mode configuration circuit connected to the switching block for configuring the dual-mode IC in one of the ISO and USB modes based upon a signal on at least one of the D-plus and D-minus pads.