Microprocessor card including a hard-wired communication circuit
DCFirst Claim
1. A card with a microprocessor and at least one contact, and a communication device in the form of a hard-wired circuit disposed between the contact and the microprocessor that checks the integrity of signals transmitted between the microprocessor and a terminal, wherein said communication device includes:
- means to determine whether an item of information received by the card from the terminal is erroneous; and
means to generate and return at least one item of information to the terminal which is a function of said determination.
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Accused Products
Abstract
The invention relates to cards with a microprocessor and contacts. The invention lies in the fact that a communication device of the asynchronous type is disposed between the contacts and the microprocessor so as to relieve the microprocessor of the communication tasks and thus allow better use of the central unit of the microprocessor and the associated memories. This device includes an analysis circuit, a circuit for checking the integrity of the series of pulses, a circuit for determining the characters in the series of pulses and pluralities of registers which are connected with the microprocessor.
11 Citations
9 Claims
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1. A card with a microprocessor and at least one contact, and a communication device in the form of a hard-wired circuit disposed between the contact and the microprocessor that checks the integrity of signals transmitted between the microprocessor and a terminal, wherein said communication device includes:
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means to determine whether an item of information received by the card from the terminal is erroneous; and means to generate and return at least one item of information to the terminal which is a function of said determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification