Smart card reader with a clock switch

Details Smart card reader with a clock switch Smart card reader with a clock switch

1999-01-20

2000-10-24

Vo, Nguyen

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455558, 455343, H04B 7005, H04B 138, H04M 100

Patent

active

061380296

ABSTRACT:
The present invention relates to a smart card reader including a connector (CON) of which one terminal is intended to deliver a clock signal (CLK) to an integrated circuit present on the card, a microcontroller (MC) intended to exchange data with the integrated circuit, an interface module (IM) comprising a first oscillator (OSC1) that generates a first clock signal (Clk1) and a second oscillator (OSC2) that generates a second clock signal (Clk2), the interface module (IM) further including a switching device (SW) controlled by the microcontroller (MC), which switching device transports either the first clock signal (Clk1) or the second clock signal (Clk2) to the clock terminal of the connector (CON). According to the invention, the switching device (SW) includes a phase detector (PD) which subjects any switching of the switching device (SW) to a simultaneity of the active edges of the first and second clock signals (Clk1) and (Clk2).

REFERENCES:
patent: 5680076 (1997-10-01), Kelkar et al.
patent: 5943613 (1999-08-01), Wendelrup et al.

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