出租车计价器的软件设计  

Software Design for Taxi Computation System

作　　者：孙秀娥[1] 叶哲江[1] 戚勇[1] 

机构地区：[1]昆明理工大学信息与自动化学院,云南昆明650051

出　　处：《山西电子技术》2007年第4期42-43,56,共3页Shanxi Electronic Technology

摘　　要：出租车计价器是单片机的一种典型应用。基于单片机的计价器是由单片机和外部电路组成。利用AT89C51的全双工串行口进行通信,其外接显示电路由74LS614和共阳极数码管构成,实现了扩展并行I/O接口的功能,可以实现单价,起步价,返程价,郊区价,夜间价,低速价,显示和修改时间。Taxi computation system is a kind of classic application of chip microprocessors, which is composed of chip microprocessors and outer electro circuit, and communicates with the use of AT89C51 serial interface. The outside display electro circuit of taxi computation system is oonsisted of 74LS614 and anode numerical display tube, which actualize the function of expanding I/O parallel interface and the function of displaying for unit price, starting price, returning price, oountryside price, night price, lowspeed price and time revising. Through connecting P0 with outer electro circuit about phonetic quotation, AT89C51 can actualize the function of phonetic quotation.

关 键 词：出租车计价器 AT89C51 74LS164 串行输入/并行输出 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置]