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Interface circuit for reading and writing IC card by CPU I/O port

A technology of interface circuit and power supply control circuit, which is applied in the field of interface circuit and can solve the problems of increasing hardware cost and so on

Active Publication Date: 2011-07-27
BEIJING EVOC INTELLIGENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing IC card (smart card) read and write operations usually use the CPU to control the read and write IC card through a dedicated chip (such as TDA8007), which increases the hardware cost accordingly

Method used

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  • Interface circuit for reading and writing IC card by CPU I/O port
  • Interface circuit for reading and writing IC card by CPU I/O port
  • Interface circuit for reading and writing IC card by CPU I/O port

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing of description, the interface circuit that the present invention uses the I / O port of CPU to read and write IC card is described further.

[0019] figure 1 It is the circuit block diagram of the interface circuit of reading and writing IC card using the I / O port of CPU in the present invention, wherein GPC3, GPG4, GPF7, GPG6, GPF4, GPF3 are respectively any 6 data references of any group of I / O ports of CPU GPC3 and GPG4 are connected to the VCC pin of the IC card through the power supply control circuit, GPC3 is used to control the voltage shutdown of the IC card, GPG4 is used for the short-circuit protection of the IC card power supply (preventing the wrong insertion of iron sheets); GPF7 is connected to the IC card The RST pin of RST provides a reset signal, GPG6 is connected to the SWI pin of the IC card (IC card detection), and GPF4 and GPF3 are connected to the I / O of the IC card through the I / O signal processing circ...

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PUM

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Abstract

The invention relates to an interface circuit which uses an I / O interface of a CPU to read / write an IC card; a first data pin of any I / O interface of the CPU is connected to a power supply pin of the IC card by a power supply control circuit; a second data pin used for monitoring the power supply voltage of the IC card is connected to the power supply pin of the IC card by the power supply control circuit; a third data pin used for providing a reset signal for the IC card is connected to a reset pin of the IC card; a fourth data pin used for detecting the card-inserting of the IC card is connected to a card-inserting detection pin of the IC card; a fifth data pin used for receiving the data of the IC card is connected to an I / O pin of the IC card by an I / O signal processing circuit; a sixth data pin used for sending data to the IC card is connected to the I / O pin of the IC card by the I / O signal processing circuit; and a clock circuit used for generating a clock signal needed by the IC card is connected to a clock pin of the IC card. The interface circuit of the invention can save the cost of hardware and improve the operation flexibility of the IC card.

Description

technical field [0001] The invention relates to an interface circuit, in particular to an interface circuit using an I / O port (input / output port) of a CPU (central processing unit) to read and write an IC card. Background technique [0002] The existing IC card (smart card) read and write operations usually use CPU to control the read and write IC card through a dedicated chip (such as TDA8007), which increases the hardware cost accordingly. Contents of the invention [0003] In order to solve the above problems, the present invention provides an interface circuit for reading and writing IC cards using the I / O port of the CPU, which can save hardware costs and enhance the operational flexibility of the IC cards. [0004] The present invention uses the I / O port of the CPU to read and write the interface circuit of the IC card, wherein: the first data pin of any group of I / O ports of the CPU is connected to the power pin of the IC card through a power supply control circuit;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/08
Inventor 刘丙毓
Owner BEIJING EVOC INTELLIGENT TECH