单片机I~2C总线和SPI接口总线复用方法研究

针对不具备串行同步总线硬件接口的单片机系统设计,提出并实现了I2C总线和SPI接口的总线复用方法。设计采用软件模拟总线时序的方法,扩展不同串行同步总线接口的外设芯片,设计了I2C总线接口PCF8583和SPI接口MAX7219外设串行同步总线间的数据线复用方法,有效解决单片机系统设计I/O口线资源不足的问题。系统运行结果表明,不同串行同步总线间的复用方法,不仅理论上是可行的,实际运行中外设器件的工作也稳定可靠,为串行同步总线的扩展提供了一种良好的解决方案。

SCM System I~2C Bus and SPI Interface Multiplexing Method Research

Aiming at the design of SCM system hardware without serial synchronous bus hardware interface,proposed and realized the I2C(Inter-Integrated Circuit) and SPI(Serial Peripheral Interface) expansion and multiplexing method.Using software method to simulate the serial synchronous bus timing,SCM system design of the I2C bus peripheral interface PCF8583 and the SPI peripheral interface MAX7219 multiplexing method,effectively solve the I/O resources shortage.System operation results show that different serial syn...