51单片机三线串行总线的虚拟接口设计

Virtual Interface Design of Three-Wire Serial Bus in 51 Microcontroller Unit

在单片机的串行总线扩展中,时钟芯片DS1302、D/A转换芯片TLC5615CP、A/D转换芯片TLC549CP等是常用的三线串行总线器件,它们都使用时钟信号线、数据I/O线和片选/复位线进行半双工同步串行数据传输,但数据传输时序各不相同,在单片机上它们的虚拟串行接口需分别独立设计,设计时要严格遵循器件的数据传输时序。

In the MCU serial bus expansion,the clock chip DS1302,D/A converter chip TLC5615CP,A/D converter chip TLC549CP is used three-wire serial bus devices,they are using the clock signal lines,data I/O lines and chip select / reset line for half-duplex synchronous serial data transmission,however,different data transmission timing.Their virtual serial interface in microcontroller to be designed separately,the design must strictly follow the timing of data transmission devices.