Based on Single Chip Embedded USB Host Research and realize, a good article

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，外部提供一个时钟作为CLK信号, 频率：f=1.1931816MHz。 定时器0输出方波的频率:fout=1.1931816/65536=18.2Hz。 输出方波的周期Tout=1/18.2=54.945ms。8253A每隔55ms引起一次中断-Electronic stopwatch design one, using the system timer 8253 provides 55ms timing units, design stopwatch timing procedures. 2, the system timing method: PC system timer 0 of 8253 working in the way of 3, to provide an external clock as the CLK signal, the frequency: f = 1.1931816MHz. Timer 0 output square wave frequency: fout = 1.1931816/65536 = 18.2Hz. Cycle square wave output Tout = 1/18.2 = 54.945ms. 8253A every 55ms caused a disruption

基于测距式的超声波测距仪，以AT89C51单片机为核心，精度高、有数字显示功能，实验精度达0.5CM-location-based ultrasonic range finder to AT89C51 core, high precision, digital display, experimental accuracy of up to mile

使用 AT89C2051 控制的数字温度测量仪表。-AT89C2051 to control the use of digital temperature gauges.

红外接收、蜂鸣器、时钟、led、lcd1602的一些源程序-Infrared receiver, buzzer, clock, led, lcd1602 some source code

l045w型段码液晶例程（汇编语言）-l045w type of code routines LCD (assembly language)

单片机C51控制，实时时钟程序，单片机掉电后重新启动仍能准确显示时间-C51 single-chip control, real-time clock procedures, single-chip power-down after the restart time can accurately show

ICCAVR编写128*64液晶程序测试已经通过-ICCAVR the preparation of 128* 64 LCD testing procedures have been adopted

本人所做项目中用51系列单片机(STC89C58RD)对OCMJ8*15B液晶屏进行数据写操作时所写的配套源代码,可以直接在keil7.0以上的版本中嵌入开发！应该说本程序有很高的实用价值（本人开发的产品已应用于实际工业控制中）-I conducted a series of 51 projects using SCM (STC89C58RD)* 15 OCMJ8 B LCD screen for data write operation written by supporting source code, keil7.0 directly on the above versions embedded development! It should be said that this program has high practical value (I development of the product has been used in practical industrial control)

简易空调控制程序 KEIL+PROTUNES-Simple air-conditioning control procedures KEIL+ PROTUNES