Interface for communication with an IC card, and apparatus fitted with such an interface
US6223298A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Dec 10, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0013
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The communications interface enables a processor unit to dialog with an IC card having an elementary time unit (ETU) for transmitting one bit that is equal to (K/Fs). The IC card includes a microprocessor, a clock pin for application of an external clock signal enabling the microprocessor of the IC card to be clocked, and an I/O pin. The microprocessor receives external data or transmits data via the I/O pin. The communications interface includes a serial communications line for interchanging data with the IC card via the I/O pin. The communications interface also includes a transmitting module, which is written-addressable by the processor unit and includes a serialization module for serializing and transmitting, over the serial communications line, data received from the processor unit. The communications interface also includes a receiving module, which is read-addressable by the processor unit and includes a serialization module for serializing data received over the serial communications line. The communications interface also includes a first clock signal having an adjustable frequency and a second clock signal which is synchronous with the first clock signal and which enable…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.