写器 design. The focus of this design lies in the utilization of the ATM89C51 single-chip microcomputer to facilitate reading and writing operations on IC cards. A reset circuit is integrated, connected to the reset pin of the 89C51, which plays a critical role in enhancing the microcomputer's resistance against interference. Moreover, a clock circuit is attached to the single-chip to set the internal oscillation time.
The RS232 serial interface serves as the bridge between the single-chip microcontroller and the personal computer (PC), enabling communication between the two. The IC card slot allows for the insertion of cards, facilitating the connection between the IC card and the reader. In this specific design, the emphasis is on the contact-based logical encryption card, specifically the SLE4442 card. Additionally, the design incorporates various peripheral circuits to ensure the overall functionality and efficiency of the IC card reader-writer.
IC cards, as an emerging industry, have become increasingly intertwined with our daily lives. With the widespread adoption of the internet and computers, their significance has grown exponentially. There are mainly two categories of IC card read-write devices: specialized readers, which operate independently due to their large storage capacity and ability to function without being directly connected to a host, commonly found in applications like smart utility meters, ATMs, and retail point-of-sale systems; and general readers, also known as online readers, that connect to a PC or application system network through parallel or serial ports. These can work with different software to read and write various types of IC cards, forming diverse application systems. When equipped with development software, they enable initial planning, data encryption, and initial writes for IC card application development.
In this particular graduation project from石家庄铁道大学四方学院, the designer chose the ATM89C51 as the core processor due to its versatility and suitability for IC card operations. The implementation of a reliable reset circuit, clock circuit, and RS232 interface, along with the selection of the SLE4442 card, demonstrates a comprehensive understanding of IC card technology and its integration with microcontroller systems.
The peripherals included in the design not only enhance the reader-writer's functionality but also contribute to its stability and user-friendliness. By addressing the technical aspects of communication, data processing, and security, this project highlights the potential for creating custom IC card applications in various industries, ranging from utilities to finance and retail.
In conclusion, the design of an IC card reader-writer based on the ATM89C51 single-chip microcontroller is a significant contribution to the field of embedded systems and IC card technology. It showcases the integration of hardware components, such as reset and clock circuits, and communication interfaces, along with the selection of specific IC cards, to create a versatile and functional device capable of catering to diverse application requirements. This project serves as a solid foundation for further exploration and development in the realm of IC card-based systems.
