IC card, reader/writer

Details IC card, reader/writer IC card, reader/writer

1996-11-01

1998-05-19

Hajec, Donald T.

Registers

Records

Conductive

235487, G06K 1906, G06K 1900

Patent

active

057539022

ABSTRACT:
A noncontact IC card, a card reader/writer, and a card system, for surely detecting a start flag, thereby reducing a communication error rate and achieving higher communication reliability. The noncontact IC card has a control unit, which includes a CPU, ROM, RAM, etc., and it further has a 1-bit flip-flop (F/F) connected between a receive circuit and the control unit. According to a program of the control unit, data are received one bit at a time, and a UART is set ready for receiving when a bit pattern of the start flag is detected. A card reader/writer is equipped with a control unit which includes a CPU, ROM, RAM, etc. The control unit inserts 1-byte dummy data "00.sub.H " between a trigger signal and the start flag at the time of transmission. A card system has a card reader/writer and a noncontact IC card. The card reader/writer is provided with a control unit, a transmitting antenna, which includes a series resonance circuit, and a switching circuit, which is connected between a receiving antenna and a receive circuit. Further, the noncontact IC card is provided with a 1-bit flip-flop (F/F), which is connected between the receive circuit and the control unit.

REFERENCES:
patent: 5030807 (1991-07-01), Landt et al.
patent: 5221838 (1993-06-01), Gutman et al.
patent: 5225667 (1993-07-01), Furuta et al.
patent: 5396056 (1995-03-01), Yamaguchi
patent: 5418353 (1995-05-01), Katayama et al.
patent: 5604342 (1997-02-01), Fujioka

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