Data transmission method and device for intelligent card chip and intelligent card

The invention relates to the technical field of integrated circuits, and discloses a data transmission method for a smart card chip, which is applied to a smart card, and comprises the following steps: in response to a control instruction sent by a card reader associated with the smart card, executing an engineering mode, and controlling a central processing unit to execute an interrupt operation; acquiring data to be transmitted in a smart card chip operation engineering mode; performing cross check processing on the to-be-transmitted data; and executing a transmission operation of the to-be-transmitted data according to a cross check result. User information can be prevented from being forged and tampered, and the safety protection capability of the intelligent card is enhanced. The invention further discloses a data transmission device for the intelligent card chip and the intelligent card. 本申请涉及集成电路技术领域，公开一种用于智能卡芯片的数据传输方法，应用于智能卡，包括：响应于智能卡关联的读卡机发送的控制指令，执行工程模式，并，控制中央处理器执行中断操作；在智能卡芯片运行工程模式下，获得待传输数据；对待传输数据进行交