Microcontrolled reader for smart cards
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 7, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Nov 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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