SH88F516单片机出租车计价器硬件设计.docVIP

SH88F516单片机出租车计价器硬件设计 摘要：出租车现在已成为人们出行最方便的交通工具，随着科技的进步，出租车计价器也发生了巨大的变化。从刚开始的只能显示路程到现在的专用自动化仪表，出租车计价器经历了从机械齿轮结构到全盘电子集成化的飞跃式变革，而且随着单片机性能不断地提高和外围设备地蓬勃发展，出租车计价器的功能也开始愈来愈丰富。基于目前出租车庞大的数量，新颖且功能丰富的出租车计价器将会有广阔的潜在市场。本文是对出租车计价器的硬件设计，重点在于设计出租车计价器的实用性和创新性。整个系统以中颖公司的SH88F516单片机为中心；采用A44E霍尔传感器对轮胎转数进行计数，实现对出租车里程的测量；采用AT24C04芯片作为存储器，用于对税控数据进行存储以及计价器在掉电的时候对里程、等待时间等信息进行存储；日历时钟芯片采用DS1302；显示接口则采用八段数码管；另外，本计价器配有打印机和GPS模块接口。9103 关键词：出租车；计价器；SH88F516；I2C总线；GPS The Hardware Design of Taximeter Abstract: Taxi now has become the most convenient means of transportation. With the developement of science and technology, taximeter has undergone tremendous changes. From the beginning of the display of journey only to special automation instrument now, taximeter has experienced from the mechanical gear structure to completely electronic integrated. And at the same time, the progress of SCM and its peripheral equipments also make the functions tximeter become increasingly rich. Based on the relatively large amount of the number of thetaxies now, innovative and rich functional taximeter will have vast potential market.This paper is the hardware design of taximeter, which focuses on the design of practicability and innovation of the taximeter. The entire system is based on SH88F516 microcontroller of SINOWEALTH Company; useing A44E Holzer Sensor to count on the tire speed, which achieves the goal of measurement of the taxi mileage; using AT24C04 chip as memory in order to the storage of the information of taxes and the mileage, waiting time and other information when power is off; DS1302 used as the external clock chip; display interface using Eight Digital Tube; in addition, this taximeter is equipped with printer and GPS module interface. 3.1.2引脚配置9 3.1.3引脚描述10 3.1.4SH88F516的Flash存储器12 3.1.5SH88F516的串行外部接口（SPI）控制器14 3.1.6SH88F516的增强型通用异步收发器（EUART）14 3.1.7SH88F516的低电压检测功能15 3.2单片机最小系统16 3.2.1复位电路16 3.2.2晶体振荡电路16 3.3里程测量模块17 3.3.1霍尔传感器的选择与论证17 3.3.2里程测量模块的设计18 3.4显示模块与按键19 3.4.1数码管与液晶屏19 3.4.2