A multi-channel contact key IC card reading and writing device
A read-write device and contact technology, applied in the direction of cooperative devices, instruments, computer components, etc., can solve the problems of complex programming, complex software simulation, and consumption of large CPU computing resources, and achieve simple debugging and low cost Effect
Active Publication Date: 2015-09-09
SOUTHEAST UNIV
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Problems solved by technology
Because ISO7816 has high requirements for timing accuracy, it is more complicated to use software simulation. Assembly programming is usually required to meet the precise timing requirements. Programming is very complicated and consumes a lot of CPU computing resources.
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[0019] The multi-channel contact key IC card reading and writing device of the present invention includes a data sending circuit 1 and a data receiving circuit 2, and the data sending circuit 1 includes a first MOS field effect transistor 11, a second MOS field effect transistor 12, a first upper A pull resistor 13 and n channel gating circuits 14 connected in parallel. The data output pin of the asynchronous serial communication of the microprocessor is used as the input of the data transmission circuit to connect the gate of the first MOS field effect transistor 11, the source of the first MOS field effect transistor 11 is grounded, and the drain is connected to the first pull-up resistor 13, An inverter is formed, and the drain of the first MOS field effect transistor is the output of the inverter, which is connected to the gate of the second MOS field effect transistor 12; the source of the second MOS field effect transistor 12 is grounded, and the drain is connected to the...
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The invention discloses multi-channel contact type secret key integrated circuit (IC) card read-write equipment. The multi-channel contact type secret key IC card read-write equipment comprises a data transmission circuit and a data acceptance circuit. The data transmission circuit comprises a first metal oxide semiconductor (MOS) field-effect tube, a second MOS field-effect tube, a first pull-up resistor and n channel gate circuits connected in parallel. The data acceptance circuit comprises a fourth MOS field-effect tube, a third pull-up resistor and n germanium diodes. When the multi-channel contact type secret key IC card read-write equipment accesses a microprocessor, the microprocessor can control a corresponding secret key IC card to reset and select a corresponding secret key IC card channel by setting input (I) / output (O) pins, and read-write of the IC card can be achieved through a serial communication interface. According to the multi-channel contact type secret key IC card read-write equipment, access cost of the multi-channel secret key IC card is lowered, programs of reading and writing the IC card are simplified for the microprocessor, and processing efficiency of the read-write equipment is improved.
Description
technical field [0001] The invention belongs to the field of ticket card reader-writers, and relates to a key module read-write device of the ticket card reader-writer. Background technique [0002] Electronic ticket cards are widely used in occasions such as canteen dining cards, telephone cards, and public utility charge cards. Since the e-ticket contains sensitive data such as a wallet, it needs to be protected by a key. When the ticket card reader operates on the electronic ticket card, it first needs to obtain the key of the ticket card. Therefore, the key calculation module of the electronic ticket needs to be installed in the ticket reader. [0003] In practice, the key calculation module is usually a contact smart IC card, which realizes the key calculation function by loading a special card operating system (COS). Contact IC card is a standardized product, regardless of its appearance or the electrical characteristics of its internal chip, it must meet the ISO / IE...
Claims
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IPC IPC(8): G06K17/00
Inventor 张宁何铁军
Owner SOUTHEAST UNIV