电子秒表的设计 1、用系统8253定时器提供的55ms定时单位，设计秒表定时程序。 2、有关系统定时方法： PC机系统中的8253定时器0工作于方式3，外部提供...

RS-485接口具有较强的抗干扰性，数据传输的距离较远，在一些应用中常常需要把RS-232标准的信号转换为RS-485的标准信号进传输。图中所示电路允许数据在RS-232/RS-485这两个不兼容的串行数据接口间传递。传输速度为480波特时，传输距离可达1750米。图中双RS-232收发器IC1将主机(PC)输出的RS-232电平转换为TTL电平，驱动高速RS-485收发器IC2 的输入，倒相器使IC2、IC3在受到起始位时被激活。-RS-485 trying to lay all the thoroughly bleed at the nose picking up the birthday 扰 fern cavity 强 ， Chu Huai basin cavity beat escapement for the birthday candle远Now ， Which instance, using Beckmannia中

　C8051F330/1 MCU 有一个可编程内部高频振荡器、一个可编程内部低频振荡器和一个外部振荡器驱动电路。可以通过对 OSCICN 和 OSCICL 寄存器编程来使能/禁止内部高频振荡器和调节其输出频率（参看振荡器框图）；可以通过对 OSCLCN 寄存器编程来使能/禁止内部低频振荡器和调节其输出频率（参看图9.3）。系统时钟可以由外部振荡器电路或任何一个内部振荡器提供。表9.1给出了内部振荡器的电气特性。 -C8051F330/1 MCU has a programmable internal high-frequency oscillator, a programmable internal low frequency oscillator and an external oscillator drive circuit. Can register on OSCICN and OSCICL programming to enable/disable the internal high-frequency oscillator and adjust its output frequency (see diagram oscillator) OSCLCN can register through the programming to enable/disable the internal low frequency oscillator and adjust its output frequency (see Figure 9.3). System clock can be external oscillator circuit, or any provision of an internal oscillator. Table 9.1 gives the electrical characteristics of the internal oscillator.

用ATmega16实现的多功能带音乐闹铃（老鼠爱大米）的数字时钟，有3个功能键设置。具体功能为：秒表计时，闹铃音乐，时钟，校时设置。可以学习状态机的编程思想。-ATmega16 achieve with the music with multi-function alarm (Lao Shu Ai Da Mi) digital clock, There are three function keys installed. Specific functions : stopwatch time, the alarm music, the clock, setting up schools. State machine learning programming ideas.

本程序是mc145572U接口驱动程序,有一些问题,希望大家指点.-This procedure is mc145572U interface driver has some problems, I hope everyone pointing.

安装在手机里的安全的免费读书软件，目前装机量已达1500万，并被内置到诺基亚、摩托罗拉、多普达等手机中。用户的手机在安装掌上书院之后，可以阅读保存在手机里的各类资料-e book reader

x5045的应用程序，多初学的朋友很有帮助！-X5045 applications, and more helpful beginner

闪光灯测试仪的程序代码，有基于proteus的仿真-Flash tester code, there are simulation-based proteus

这是用iar环境编译的程序， 主要适用于msp430f149单片机 程序的内容是模拟比较器。-This is used to compile the procedure iar environment, mainly applicable to MSP430F149 single-chip process is the analog comparator.

x5045的C51程序，实现看门狗和E2PROM功能-x5045 C51 procedures, and the watchdog function of E2PROM

在ST单片机上实现GPS交通警示器功能.-In the ST to achieve single-chip GPS traffic alerts functionality.