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Method for CPU processing received data in radio frequency non-contact smart card

A non-contact smart card, data receiving technology, applied to record carriers, instruments, induction record carriers, etc. used in machines, can solve problems such as difficult data, and achieve the effect of increasing chip area, reducing complexity and cost

Active Publication Date: 2008-10-29
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at this situation, and the method provided can well solve the problem that the CPU is difficult to process the decoded data

Method used

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  • Method for CPU processing received data in radio frequency non-contact smart card
  • Method for CPU processing received data in radio frequency non-contact smart card
  • Method for CPU processing received data in radio frequency non-contact smart card

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] A specific implementation description of the method is given below with reference to the accompanying drawings.

[0022] When using this method, the CPU clock frequency needs to be increased, and there are two options for increasing the CPU clock frequency:

[0023] Method 1: Switch the clock frequency after receiving each byte of data (refer to figure 2 schematic diagram).

[0024] The specific operation method is as follows:

[0025] When there is data after receiving a byte of data: CIF generates a clock frequency switching signal a after receiving a byte of data, and then generates a CPU wake-up signal b after the pause. After the CPU is woken up, the operating frequency of the CPU has been increased through the clock switching circuit. At a higher frequency, the CPU finishes processing the previous byte of data within a certain period of time. After the CPU finishes processing the data, it can enter the power saving mode and switch the operating frequency of t...

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Abstract

The invention relates to a method for CPU processing and receiving data in a radio frequency contactless smart card. When a card reader is communicated with the radio frequency card, the radio frequency card receives the data sent by the card reader, and the received data is sent to a CPU for processing after the demodulation and decoding. While a coding mode is a miller code in the protocol of the contactless smart card which is in line with ISO14443 type A; a carrier wave is modulated by the miller code, and each code cell or character almost has the pause of the carrier wave. When in pause of the carrier wave, a chip has no carrier wave signal, and the chip has no energy of an external power supply and also possibly has no clock. Therefore, the data (characters) which is output to the CPU after the decoding are difficult to process by the CPU. The invention uses a more innovative method that when the next received byte is demodulated or decoded after every byte is decoded, the CPU is worked at the proper frequency to rapidly process and receive the last byte, thus simultaneously realizing the receiving and the processing of the data.

Description

technical field [0001] A method for realizing CPU processing received data in a radio frequency card relates to the field of digital signal processing, and specifically relates to a method for realizing CPU processing data. Background technique [0002] IC (integrated circuit) smart cards are being developed and have been integrated into the mainstream of today's information technology. With its high degree of information integration and high security, it is becoming more and more brilliant and brilliant. [0003] With the continuous development of the financial industry and the rapid changes of the social economy, especially the public transportation industry, wireless communication field, health care industry, closed place management, identification, telephone communication, building security system, etc., people have more and more The start of accepting and using IC smart cards. Especially in the banking service system, IC smart cards have gradually matured to serve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00G06K19/07
Inventor 张建平张玉禄余秋芳许珊琳田勇
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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