Card-reading circuit, card reader, and card-reading system

A card reader comprising a card holder and a card-reading circuit;

• wherein
• the card-reading circuit comprises a connection module and a communication control module;
• the connection module comprises a first connection unit and a second connection unit, a first end of the first connection unit and a first end of the second connection unit are both configured to connect to an integrated circuit chip of an integrated circuit card;
• the communication control module comprises a first communication control unit and a second communication control unit, a first end of the first communication control unit connected to a second end of the first connection unit, a first end of the second communication control unit is connected to a second end of the second connection unit, a second end of the first communication control unit and a second end of the second communication control unit are both connect to a reading end of a central processing unit (CPU), when the first communication control unit is working, the CPU reads the integrated circuit chip through the first connection unit, or when the second communication control unit is working, the CPU reads the integrated circuit chip through the second connection unit;
• wherein, at the same moment, one of the first communication control unit and the second communication control unit works;
• the card holder comprises a first board surface and a second board surface, the first board surface and the second board surface clamp to form a card slot for inserting the integrated circuit card, the first end of the first connection unit is located on the first board surface, and the first end of the second connection unit is located on the second board surface, so that when the integrated circuit card is inserted into the card slot, the integrated circuit chip of the integrated circuit card is connected to the first end of the first connection unit or the first end of the second connection unit.

A card-reading system comprising a central processing unit (CPU) and a card-reading circuit;

• wherein
• the card-reading circuit comprises a connection module and a communication control module;
• the connection module comprises a first connection unit and a second connection unit, a first end of the first connection unit and a first end of the second connection unit are both configured to connect to an integrated circuit chip of an integrated circuit card;
• the communication control module comprises a first communication control unit and a second communication control unit, a first end of the first communication control unit connected to a second end of the first connection unit, a first end of the second communication control unit is connected to a second end of the second connection unit, a second end of the first communication control unit and a second end of the second communication control unit are both connect to a reading end of a central processing unit (CPU), when the first communication control unit is working, the CPU reads the integrated circuit chip through the first connection unit, or when the second communication control unit is working, the CPU reads the integrated circuit chip through the second connection unit;
• wherein, at the same moment, one of the first communication control unit and the second communication control unit works;
• the CPU is configured to:
• output a first level signal to a control end of the first communication control unit and a control end of the second communication control unit to control one of the first communication control unit and the second communication control unit to work;
• if the CPU does not read the integrated circuit chip within a preset time period after outputting the first level signal, outputting a second level signal to the control end of the first communication control unit and the control end of the second communication control unit, to control the other one of the first communication control unit and the second communication control unit to work.