LCD12864显示模块与微处理器的接口设计(并接)

1、 LCD12864显示模块与微处理器的接口设计3中国矿业大学信电学院史良摘要文章详细介绍了LC D12864显示模块的特性、及显示程序流程图。关键词LC D12864显示模块液晶能仪器的设计, , 因此仪器中就必须配备各种各样的显示器, 以便显示输入参数和测量输出的结果。在便携式低功耗仪器中, 为了缩小体积、降低功耗, 仪器一般都采用液晶显示器LC D (Liquid crystal display 。这里介绍一种新型的液晶显示模块LC D12864。1显示模块(LC D 12864 的特性LC D12864为数字点阵式液晶模块, 它包括12864点的液晶面板、C MOS 驱动。由于该模块有整

2、体的图形点阵显示, 因而用它来显示图形和字符。它具有如下特性:C MOS 大规模集成电路LC D 驱动; 大容量图形类型, 能够显示数字、字母、特殊字符、曲线、图表和模型等; 阳性驱动; 高对比度、宽视觉范围; 1/64分辨率。2LC D 12864的管脚说明表1LC D12864的管脚说明管脚名称功能1G ND 地2VDD 逻辑电源3V0LCD 电源4D/I数据/指令控制信号:D/I=1, 数据输入;D/I=0, 指令输入5R/W数据指令读写控制信号:R/W =1, 数据指令读出;R/W =0, 数据指令写入6E 允许控制信号714D0-D7数据总线15CS1片选信号1, 高电平有效16CS

3、2片选信号2, 高电平有效17RST 复位信号, 低电平有效18VEE 负电源(-10V 输出3LC D 12864的显示模式LC D12864的显示模式见表2。表2LC D12864的显示方式控制指令代码R/W D/I D7D6D5D4D3D2D1D0功能显示开/关000011111I/O 控制显示器的开/关状态此时内部RAM 和状态不能被接受,1:ON;0:OFF初始行设定0011初始行设定(063 选择一个特定的RAM 单元作为显示的第一行, 在显示器的上方页面设置0010111页面(07 设置RAM 的页面值, 也即显示器的X 坐标值设置Y 值0001Y 值(063设置显示器的Y 坐标

4、读显示器内部状态10000读显示器状态:RESET 1:复位;0:正常ON/OFF 1:显示器关;0:显示器开BUSY 1:内部在运行;0:准备状态写数据01写数据将D0D7的数据写入显示器的RAM 中读数据11读数据将显示器中RAM 的数据通过D0D7读出来4LC D 12864与微处理单元的连接在电路中,LC D12864与单片微机的接线如图1。3本文项目受国家自然科学基金(项目批准号:59874028 资助此时,LC D12864可通过单片机的P1口选择控制。由显示器的时序图(图2、图3 可知每向显示器写入一个数据/指令或读出一个数据/状态时, 均需给使能端E 一个脉冲的下降沿, 这时可

5、考虑使用单片机的读/写信号的下降沿来驱动(图4、图5 。在61矿业安全与环保1999年第5期MINING SAFET Y &ENVIR ON MENTA L PR OTECTION N O. 51999 图1 图2LC D12864 的读操作图3LC D12864 的写操作图4单片机读外部RAM 的时序图5单片机写外部RAM 的时序图6程序流程图本电路中采用单片机的读信号和写信号相与输出的信号接入使能端E 即可完成对显示器的操作。5显示程序流程图显示程序流程如图6所示。参考文献1刘富强. . 中国2. 系统配置与. ,19903. 煤矿多媒体监测监控系统及其关键技术研究. 煤炭学报,1998(

6、4(收稿日期:1999-03-25; 责任编辑:吴自立(上接第15页832Nm 3/h , 氮气纯度为97. 32%, 氮气出口压力为0. 5MPa , 起动时间21min ; 当由2台该型号压缩机向制氮设备供气时, 氮气产量为1050Nm 3/h , 氮气纯度为97. 25%, 氮气出口压力0. 6MPa , 起动时间23min 。在一个月的运行考核中, 制氮机未发生故障停机, 运行稳定、可靠和移动性好。利用该制氮设备生产的氮气, 向南一采区综放工作面顺槽注氮, 注氮量为13944m 3, 使封闭已久约12000m 3的火区彻底熄灭; 向南二综采放顶煤工作面开眼注氮, 注氮量144240m

7、3, 使封闭约13000m 3的火区彻底熄灭。7结论(1 首次采用变压吸附制氮技术成功地研制出制氮设备, 经在华亭矿管会砚北矿的工业运行及性能考核, 主要技术指标达到设计要求, 它的研制成功, 为我国煤矿防灭火提供了大型移动式氮气源设备。(2 在广泛吸取国内外变压吸附碳分子筛制氮工艺流程优点的基础上, 结合我国铁路、公路和矿区运输条件而进行的优化设计, 具有技术上的先进性和经济上的合理性。(3 本课题的技术创新在于成功地解决了大气量压缩空气的净化、大型吸附塔的结构形式、专用气流分布器、防止分子筛喷出和粉化的独特压紧装置以及检测仪表的信号输出可与K J 4煤矿环境监测系统联网等关键性技术。参考文

8、献1王长元, 陈孝通.JXZ D -400型井下移动式碳分子筛制氮车的研制. 煤炭工程师,1998(1 :2326(收稿日期:1999-05-24; 责任编辑:唐自强71矿业安全与环保1999年第5期MINING SAFET Y &ENVIR ON MENTA L PR OTECTION N O. 51999AB STRACTS IN EN G LISH OF THIS ISSUE(The serial numbers of the abstracts are identical with those in the contents Along with the advance of Scie

9、nce and technology ,man -made faults have become main factors to cause accidents. It is systematically analyzed and studied for the concept of man -made faults and the causes of faults made by underground coal miners in the paper. Based on the study ,a set of measures are put forward to control faul

10、ts made by miners in underground coal mines.The paper describes the structrure ,principle s oftware ,and operation results of device for steel belt in main cooperatively by the of Jincheng Mining Bureau and the C ollege. C ontinuous m onitoring for joints of steel belts and broken wire and warning o

11、f faults can be realized by using electromagnetic probes and com puter in the system. It is dem onstrated by application that the device is accurate in detecting data , convenient , flexible in operation and safe , reliable in performance.Experiment of electromagnetic radiation technique to predict

12、outburst risk was carried out in a coal heading face in F 15seam. in No. 8Mine of Pingdingshan C oal C o. Ltd. (G roup . Based on investigation of the experiment , the relationship between electromagnetic radiation and outburst risk in front of the face was derived and the critical value of outburst

13、 prediction index was obtained preliminarily. The operating principle ,technical parameters ,structure , function and the developed result of M odel SG S dual -function high -pressure water gauge were dealt with in detail in the paper. The gauge can simultaneously measure quantity and pressure of wa

14、ter in fused into coal seam. Dewatering tests were conducted under pressure for fine coal powder of 3kinds of coal form Y anzhou , Dadun and Xuzhou. The in fluence of pressure and surface active agent on the m oisture of filtered sam ple cake was investigated and the filtering speed and dewatering r

15、esult were measured. The measured results were com pared with that obtained under vacuum condition.The paper described the principle of nitrogen generation , technological process (selection and arrangement of necessary equipment , performance test and fire -fighting results of type KY Z D -800large

16、 m obile nitrogen generation installation of mine use on surface.The characteristics , pin description , display m ode ofNew LC D1284display m odule , its connection withmicroprocess or and flow chart of display process were presented in detail in the paper. The m odule can find wide application in

17、intrinsically. Safe instruments with low power consum ption used in coal mines.In No. 2occurred frequently with boreholes to drain gas s first mining of the thin seam of outburst. In order to s olve the problem , were arranged in the hard slice in stead by making full use of the great difference of

18、outburst risk between the s oft and hard slices. Thus initial success was obtained in the experiment of long -hole v olley shotfiring to prevent outburst of gas and coal.The chemical separation results of antiager A with different dispersity against spontaneous combustion of long flame coal from G e

19、ncun Mine in Y ima was researched. It was shown by the research result that antiager A has obvious separation effect on spontaneous combustion of the coal , and the separation effect can be im proved with the increase of dispersity of antiager A. The effect of 5%antiager A with disperser can be high

20、er than that of 20%magnesium chloride , only a little lower than that of 5%antiager A without disperser. With disperser added ,the used am ount and cost of antiager A can be cut down greatly.Based on the analysis of hydrogeological condition of Liuqiao No. 2Mine ,it was indicated that the main cause of actual water in flow bigger than calculated one was expansion of openings of rock cracks resulted by shock from blasting , water washing and rock displacemnet under co