Intelligent card and method for accessing flash memory of intelligent card

A smart card and flash memory technology, applied in the field of smart cards, can solve the problems of code readability, simplification, cumbersome flash memory access, and easy to generate errors, etc., to achieve the effect of convenient programming and simplifying the process of flash memory reading and writing.
CN101840520BInactive Publication Date: 2012-07-25BEIJING WATCH DATA SYST
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING WATCH DATA SYST
Publication Date
2012-07-25
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses an intelligent card and a method for accessing the flash memory of the intelligent card, relates to the field of intelligent cards and aims to solve the problem that a large quantity of flash memory interface functions need calling in a main program body when the intelligent card is accessed in the prior art. The method for accessing the flash memory of the intelligent card comprises the following steps of: setting the access right of a flash memory address to be unavailable to be read or written in an address protection unit; when a command code accesses a protected flash memory address, performing data exception processing to obtain the command type of the command code and command information corresponding to the command type; and accessing the flash memory of the intelligent card according to the command type and the command information corresponding to the command type. The invention also discloses the intelligent card for accessing the flash memory of the intelligent card by the method. The method is used for accessing a memory space by using the intelligent card.
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Description

technical field

[0001] The invention relates to the field of smart cards, in particular to a smart card and a method for accessing the flash memory of the smart card. Background technique

[0002] The smart card hardware structure generally includes a central processing unit (CPU), random access memory (RAM), programmable read-only memory (EEPROM) and read-only memory (ROM). EEPROM is a non-volatile storage unit. Because of its high cost and small storage space, it is gradually replaced by NOR FLASH and NAND FLASH with mature technology, low cost and large storage space. Both NOR FLASH and NAND FLASH are flash memory chips, which are non-volatile memories that are erased and reprogrammed in blocks.

[0003] In the actual program writing process, when it is necessary to access the flash memory, its read and write operations need to be erased by block, and then written. Generally, this process is through calling a specific flash memory in the main program written. Interface ...

Claims

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