If the chip remains sending state , it will take the data spread spectrum and modu - late , then sent forth by ad9768 . the chip can be controlled throug h writing data in the interior 87 registers . secondly , this paper designed control system of twice civil air defense alarm system . because the scm " s port number was limited and port driving power is feebleness , this design realizes nixie tube ' s display drive with keyboard management chip max7219 and realizes true time display with ds1302 , which can economize scm i / o port and make circuit connection simplicity 通过对其内部87个寄存器写入数据可对其进行控制。其次,本文对二次人防警报系统控制系统进行设计,针对单片机端口数目有限、端口驱动能力较弱等问题,使用键盘管理芯片max7219实现数码管显示驱动,用ds1302实现真时钟显示,节省了单片机i / o口,电路连接简单。
At last , we gave the circuit connection method of web browse function and ethernet / rs232 gateway function and the detailed resolvent to improve the results of theory research . the result indicates that it is feasible to access internet with the method of micro controlling unit and virtual software package . this method will provide a new kind of resolvent to appliance accessing intemet , long - distance controlling and long - distance data collection 最后给出了实现网页浏览功能和ethernet rs232网桥功能的实验线路连接方法及具体实验方案,来证明理论研究的结论。实验结果表明采用8位微控制器与虚拟软件包相结合的方式接入internet是完全可行的,这将为家电上网,远程控制,远程数据采集等提供一种新的解决方案。
In the course of design , we fully consider the actual conditions on the railway and take a series of corresponding measures to the concrete problem . such as we select high - accuracy microconvertor and have the converted function in succession data collecting system chip aduc812 , design v / f circuit and external a / d circuit . in anti - interference of the hardware , we try to disperse each function module to avoid interfering each other , adopt photoelectric isolated technology to dispel the circuit connection of input and output . in controlling we import arithmetic mean into strain wave algorithm and real computing technology of virtual value for sample treatment of data , that is using the software to smooth away interfere error and to calculate actual value , thus it makes the precision of the data improve greatly 在设计过程中,根据系统要求,充分考虑铁路上的实际情况,针对具体问题采取了一系列的相应措施,如在器件选择方面选用高精度microconvertor系列、具有adcdma连续转换功能的数据采集微控制器芯片aduc812 ,设计了v f变换电路和外部a d转换电路;在硬件抗干扰方面,将每个功能模块尽量分散独立开来以避免相互干扰、采用光电隔离技术消除输入输出通道上的电路联系;在控制方面对于采样数据的处理引入了算术平均值滤波算法和真有效值的计算方法,即通过使用软件来滤除系统中有干扰造成的误差并计算真值,从而使数据的准确性得到极大地提高。