Microcontrolled reader for smart cards

Details Microcontrolled reader for smart cards Microcontrolled reader for smart cards

1990-10-31

1992-07-07

Trafton, David

Registers

Coded record sensors

Particular sensor structure

235492, G06K 706

Patent

active

051285231

ABSTRACT:
Reader for smart cards comprising a supply for the circuits of the card, a means of controlling information exchanges between the card and the reader and an input for digital signals from a pay-television system. The means of control comprises a first microcontroller which receives the digital signals and which controls a second microcontroller which itself controls the exchange of information with the card and delivers power supply control signals as a function of the information received from the card. The outputs from the first microcontroller are at a fixed potential during the resets and the outputs from the second microcontroller are at a floating potential during the resets. A port enables the first microcontroller to control the power supply during the resets.

REFERENCES:
patent: 4682224 (1987-07-01), Ragan et al.
patent: 4772783 (1988-04-01), Ono et al.
patent: 4785166 (1988-11-01), Kushima
patent: 4808802 (1989-02-01), Kano
patent: 4920256 (1990-04-01), Marty et al.
patent: 4990760 (1991-02-01), Tomari et al.
Patent Abstracts of Japan, vol. 10, No. 223 (P-483)(2279), Aug. 5, 1986, M. Nishikata, & JP-A-61-59586, Mar. 27, 1986, "IC Card Reading Writing Device".

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