針對嵌入式系統在實際應用過程擴展端口的需要，并結合PIC18F458 控制車身狀況
顯示時的實際應用，介紹了I2C 接口的ZLG7290 芯片的具體應用，包括PIC18F458 的編程
控制、系統硬件連線、軟件設計時應注意的問題。
[關鍵詞] I2C 總線 嵌入式系統 PIC18F458 ZLG7290

Port Extension Technique Research of PIC Microcontroller Based on I2C Bus
Tan Ping1, Liu Jian-xin2 ( 1. School of Mathematical &Computer Science, Xihua University;
2. School of Mechanical Engineering & Automation, Xihua University, Sichuan,Chengdu,610039，China) [Abstract] In order to extend the port of an embedded system with PIC18F458, which mainly
controls the display of automotive body status, the ZLG7290 is introduced. The principle of I2C, involved register control of PIC18F458, hardware configuration and rule of software development are emphasized.
[key word] I2C Bus Embedded System PIC18F458 ZLG7290