Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1998-06-30
2000-11-21
Hajed, Donald
Registers
Systems controlled by data bearing records
Credit or identification card systems
235491, 235492, 235493, G06X 0500, G06X 1906
Patent
active
06149058&
ABSTRACT:
A chip card reader may be connected to a microcomputer to provide for data exchanges in the read or write mode between the card and the microcomputer, under the control of the microcomputer. The reader is capable of carrying out data exchanges between the card and the microcomputer and works without a microprocessor. The chip card reader is provided, firstly, with a data buffer memory enabling the temporary storage of the pieces of data read in the card, and, secondly, with a frequency divider programmable by a frequency signal to set the bit time at will. By the division of frequency of an internal clock of the reader, this bit time is the duration corresponding to the transmission of a data bit in the data exchanges between the chip card and the reader. The reader can then carry out transmissions with slow or fast protocols independently of the microcomputer.
REFERENCES:
patent: 4803351 (1989-02-01), Shinenaga
patent: 4916296 (1990-04-01), Streck
patent: 5146499 (1992-09-01), Geffrotin
patent: 5590306 (1996-12-01), Watanabe et al.
patent: 5664157 (1997-09-01), Takahira et al.
patent: 5809241 (1998-09-01), Hanel et al.
Galanthay Theodore E.
Hajed Donald
Rodriguez Douglas X.
STMicroelectronics S.A.
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